I would argue that it doesn't receive enough recognition on this site. Yes, it receives some recognition but other zoos like Franklin Park, Cleveland, Akron, Detroit, Minnesota, Milwaukee, and Woodland Park are notable zoos that receive a ton more of praise compared to Toledo. Just look at its news thread, it only has 5 pages while Detroit has 11!
As JVM already said, news threads are definitely not the best way to gauge a places popularity or overall opinion on this site. The activity in those threads is largely driven by the members that live near those zoos and how frequently they provide updates about their home zoos. Milwaukee especially is a good example of this as there are quite a few members here that are quite active from Wisconsin (almost to a point that zoo has an outsized representation of "homers" on this site). When you add in the the members from the Chicago area, Milwaukee is very well known and well visited by members on this site.
Of the zoos you mentioned, I wouldn't agree that they all get more "recognition" on this site than Toledo. Akron I hardly ever see mentioned on here and Franklin Park, if mentioned, normally seems to be mentioned for people to lament that it is not all that noteworthy. In the case of Minnesota, Woodland Park, and Detroit, I would argue the recognition is earned as those zoos are all better zoos than Toledo. With saying that, it is important to remember that ranking zoos is a purely subjective matter and no two people will ever completely agree.
For me, those three zoos fit into one of those categories I described in my first comment of having at least one world class exhibit (MN-Russia's Grizzly Coast, WP-Living Northwest Trail, Detroit- Polk Penguin, Amphibiville, Arctic Ring of Life, Red Pandas) and then everything else being mostly above average in terms of exhibitry. Franklin Park while not necessarily having anything outstanding, also doesn't have anything all that bad. I have not been to Cleveland or Akron so can't comment on those very much.
By comparison to these zoos, Toledo has one world class exhibit (ProMedica), a couple good ones (aquarium, aviary, and reptile house), and then a lot of below average ones. Toledo just has too many poor exhibits to truly be considered amongst the top zoos, in my opinion. The people on this site that I have seen really rally behind Toledo as a top notch zoo are those that seem to care less about the level of exhibitry and instead put more emphasis on the number of species held. While, I am at times guilty of this, Toledo's collection isn't big enough or significant enough to elevate it above Minnesota, Woodland Park, or Detroit as they mostly offer a more consistent level of exhibitry. This is not to say that one of these systems for ranking places is necessarily better than the other, but members on this site in general seem to put a greater emphasis on exhibitry than collection size (even though many of us still lament the downsizing of collections at the same time).
The outdoor exhibits are not on par with their indoor habitats but they still have some heavy hitters (Tembo Trek, Pheasentry, Flamingo Key, Africa!, and Arctic Encounter). The ape habitats are the weakests parts of the zoo IMO, but tiger terrance could be a lot better.
I'd like to get a better understanding of how you are using the term "heavy hitters" here, because I don't think I would describe any of those exhibits as "heavy hitters" unless you are just using it as a catch all for the major exhibits at the Toledo Zoo/exhibits with popular ABC animals. None of those areas hold up all that well in comparison to other zoos. Tembo Trail is dated and felt like a mess when I was there with a bunch of random animals thrown in, while the level of exhibitry also is not great. Flamingo Key is nice enough, but does it really stand above any other flamingo yard enough to bring Toledo extra recognition? With that, how often do see Flamingo aviary's being mentioned on this site in general? You have already pointed out the major flaw with Africa!, but in addition to this it is important to understand that so many zoos have significant African areas that it is hard to stand out in this area and Toledo is quickly overlooked for this reason (Tembo Trail also suffers from this with it's original African focus). The Pheasantry is unique and has some rarities, but in terms of exhibitry is it really better than the rows of aviaries found at countless other zoos? Arctic Encounter was excellent when it opened, but with so many new polar bear exhibits that have opened in the last 10-15 years, it now looks pretty outdated.
As for the indoor exhibits, from what I've seen only a few zoos compare. Omaha for the aquarium,
So saying Toledo has one of the best zoo aquariums in the country is kind of like saying "San Diego has one of the best panda exhibits in the country". Just like there are very few zoos that have Giant Pandas, there are very few zoos that have notable aquarium complexes and it is pretty easy to be seen as "one of the best". That being said, in addition to Omaha's, I would say Point Defiance (Tacoma) and Indianapolis both have better aquariums. I have not seen them, but I'm guessing I would also think the one in Pittsburgh and the new one in Kansas City are also better than Toledo's. Columbus also has one, but truly don't really know how that is viewed and I have not seen it. Brookfield and John Ball (Grand Rapids, MI) also have notable aquariums, although I don't know if I'd necessarily say they are better or worse than Toledo's. The only significant zoo aquariums I can think of that I would say are definitely not as good as Toledo's is Minnesota's and Oklahoma City (which I think is now closed). In the case of Minnesota there is nothing really bad about it, its just pretty boring and uninteresting when compared to others. So basically for me (and I'm sure others on here), of the bigger "zoo aquariums" were looking at Toledo's slotting in probably around the 5-8 spot of about 10 total. While having an aquarium of course earns them points over zoos that don't, I wouldn't necessarily put it as one of the best.
Bronx for the aviary (maybe dc), Bronx? for the reptile house and no other compare for the museum. After visiting 50 different zoos,....I have not visited Bronx but I do plan on soon.
This honestly is the most telling part of your comment for me. The idea that the Bronx has the only aviary and especially reptile house that can compete with Toledo's leads me to believe your "zoo" travels have largely been focused on those closest to where you live, which often means a number of major zoos, but mostly mid-major to smaller zoos. And as another member of ZooChat recently owned up to on here, you can't truly judge an exhibit just based on pictures in the galleries.
For me, the Bronx for sure wouldn't crack my top 5 for reptile houses, but I'm not sure if it would be in the top 10. Fort Worth, San Diego, Dallas, St. Louis, Nashville, and Atlanta all immediately come to mind as having better reptile houses than the Bronx. Knoxville and Detroit, though smaller than the others, could also be thrown in there for consideration and while Omaha doesn't have a dedicated reptile house, it has quite a significant collection of reptiles on display. Los Angeles also immediately comes to mind as a reptile house I've heard a lot about, but still haven't seen. Again, these are just the ones off the top of my head and I know there are more I've seen that I'd have to consider in this.
Toledo is still one of my favorites and I personally like their reptile and aviary to be the best I've visited.
This gets into a little bit of what I was saying in my first comment about people often saying a place is "underrated" because they really enjoyed it (or have an emotional connection to it) and they can't understand how other people can disagree with them. For me "Favorite" and "Best" are two completely different things. "Favorite" implies that I really liked it because I had such a great experience there, but that was my own personal experience and not everyone's will be the same. "Best" implies that I have set that experience aside and taken a critical look at the facility in comparison to others.
My "favorite" zoos don't necessarily line up with the zoos I view as the "best". For example, I grew up going to the Minnesota Zoo and Como Park Zoo and never really went to any others until I was in college. One of the first zoos I visited when I got older was the Milwaukee County Zoo and I was amazed at the zoos size, many different buildings, and animals they exhibited and couldn't understand how people on ZooChat would ever say Minnesota is better than Milwaukee. At that time, I largely saw Minnesota for what it was not. As my zoo travels became more extensive (somewhere around 275 at this point, working on fleshing out my list/rankings) I am now better able to understand why others feel that way. Milwaukee is still one of my "favorite" zoos, but right now is sitting at around 35th "Best" on my lifetime zoo rankings and I still have more zoos to enter that will bump it lower. For nostalgia reasons, Como Park is still one of my "favorite" zoos, but understandably no one talks much about it here on ZooChat, because there isn't really that much significant about it.