I've never been a fan of seeing domestic animals in zoos, unless they are really interesting looking or striking or extremely cute etc - and of course if they aren't in a "farmyard area", then I don't understand why they even display them. Even semi-domestic animals such as water buffalo bore me to tears.
I also get a bit bored when a zoo displays far too many species of ungulate. Don't get me wrong, I do like ungulates, but I don't really want to see 7 species of deer, 7 species of wild goat, and 7 species of antelope all in the same zoo. I much prefer zoos which display one deer species, one antelope species and then use the leftover resources to display other interesting animals. I think that Mogo Zoo (in Australia) really does this well. The ungulates they have on display are White Rhinos, Giraffe, Zebra and Fallow Deer (and the deer can be fed) - I really like this model because all four ungulates are very different to each other. Another zoo in Australia (Altina) simply displays every ungulate species it can get its hands on, and I just find it a boring zoo for that reason.
The other thing I find is that I don't really get excited about seeing an animal which I feel is "out of place" - so if a zoo has an African savannah theme, then I feel that Gorillas are out of place as rainforest animals, and I've got myself in the headspace to see savannah animals.
Like others who've commented here, I'm also not a great fan of chimpanzees - and I don't really know why. Perhaps it's that their simply too similar to humans and I go to zoos to get away from people.... who knows.... I love watching most primates, but for whatever reason chimps just don't do it for me.
And of course, as an Australian, most Australian animals are less interesting to me than exotic animals for obvious reasons.
That said, I love visiting zoos and I do tend to enjoy watching any animal - even the ones I'm not too enthusiastic about.