I don't think I hate any expansion, but yeah Prosperity is at the bottom for me. I remember a friend had this box, and we'd get groups together to play, and I'd always start out thinking "I should use cards from this since I don't get to play with it as often," then looking over the cards and having trouble picking some.
I'm no expert, but I will stand by Goons as probably the worst card in Dominion in terms of "promotes monolithic play". I'd be interested to see a board with Goons where "be able to play as many Goons as quickly as possible" isn't the only winning strategy. I guess maybe some sort of extremely fast pileout board, which would probably also trounce anything else considered monolithic (like Rebuild, say).
There are several cards in Prosperity that are fine, but a bit boring. This isn't just because it's an early expansion. Compare Worker's Village (a fine village!) with Mining Village which is probably a less helpful village, but a lot more interesting to play with. In fact, Worker's Village ends up making buys on other cards feel less valuable, because you know you're going to need a couple villages anyways, so you'll be getting "buys for free". Another example is Monument (I do like this card though!). Loan and Trade Route are others where, it seems okay as a single card trasher, but is it really that fun? If there's any other trasher, this is probably redundant and of questionable utility (and Loan can cause you to skip your other trasher). If there is no other trasher, I always feel like these guys force themselves to be useful, rather than feeling fun/interesting in their own right. I'd also prefer it if Loan could put the revealed treasure back on top as an option.
There are also cards that are just old cards +1, but where this extra +1 warps the potential strength of the card so greatly that it must be priced too high for early gameplay. As a result I end up enjoying the earlier versions better, unless Platinum/Colony are in:
-Throne Room (almost always fun!) vs King's Court (sometimes just too bonkers for me, also 'sort of' monolithic). Meanwhile, I love the middle ground of Royal Carriage.
-Remodel (almost always fun!) vs Expand (sometimes fun, but other times is this even worth it by the time you can afford it?). Meanwhile, I love the middle ground of Transmogrify, Butcher, Taxman, some others. I also like Forge as a more interesting version of an expensive super-remodeler.
-I think Market and Grand Market are both a bit boring, but at least Market is available for more of the game in some sense.
All that said, let me list some other cards from Properity I do really enjoy, since I claim not to hate it:
-Watchtower (super cool reaction especially for certain boards)
-Contraband (one of my favorite interactions)
-Rabble
-Bank