God of War series: I tried the first one, both on a PS2, and the HD remke on PS3. Just, so, boring. Bayonetta did everything it did, better.
Devil May Cry series: I've tried DMC 1 and 3, and Bayonetta did everything better. Heck, Dynasty Warriors is more fun.
Kingdom Hearts series: Tried 1 and 2, and was turned off by the horrible gameplay and the annoying Disney characters. Probably doesn't help that I don't care for Disney... Although Chain of Memories on the GBA was pretty fun...
The Elder Scrolls IV: Oblivion: Make an open-world game, claim it to be an RPG, when there's no Roleplaying in it. Take out a bunch of weapon types and spells that was in the previous game, while improving how combat works. Worst part? Make such a big massive world, tell you to explore, put NOTHING in said world, and just let you teleport round everywhere for FREE. Oh yeah, big fun. Except, y'know, it's not.
Fallout 3: Oblivion with guns, nuff said. First 2 weren't very good, either...
World of Warcraft: It's just not that good to me, I can't force myself to like it. Thinkin' abotu givin it another shot after Cataclysm comes out, sicne it's suppose to really change a lot fo stuff
Baldur's Gate: Horrible controls. I just absolutely HATED the interface and control scheme, and it really just killed any fun I could have possibly had with the game.
Planescape: Torment: See above.