I always imagine if peafowl were only held in a few collections; they'd be prized beyond measure by zoonerds. They truly are extraordinarily beautiful birds.
In terms of species I don't like seeing, I've given this a lot of thought. Despite their overexposure, I still enjoy see most ABCs. However, the one exhibit that really leaves me cold is the cookie cutter South American 'pampas' one. A mixed species effort of some combination of tapir, capybara, mara, rhea and if you're lucky giant anteaters. I've seen it so many times and it's deathly dull. These species can still be interesting, but not like that.
If you really backed me into a corner, I might say ratites. I never linger at these exhibits, but I still don't hate them. Also, I do really like seeing cassowaries, and I do hope to see kiwi one day (I only just found out the kiwis are ratites by the way).
Basically, this question is impossible, especially because of the use of the word 'hate'.