Fallout, Fallout 2, and Fallout New Vegas.
So, I don't like the combat system of the original two, and I dislike the whole.. twangy country western feel of the New Vegas. I like Fallout 3 though, its got a terrible story but when has a Bethesda game ever been about the story?
Final Fantasy
7, 8, 9, and 10. I played 6 for a bit and liked it though. The 3D final fantasy games just are NOT my cup of tea. Cool if you like them but the characters are all obnoxious to me, and look silly. Wanna know something else? I liked X-2 a little bit. It seemed to go about itself with an inherent sense of camp and felt like a corny action movie, right down to the introduction. The story was stupid, and the gameplay annoyed me still, but when it embraced its own stupidity it was a little enjoyable. That said? A thousand words is still the best scene from any Final Fantasy game.
Dead Space, and Dead Space 2
Short answer here, it is a very confused game that doesn't know what it wants to be.
Magicka
Its insanely difficult for all the wrong reasons. Like being knocked off a cliff because you were charged in the middle of charging a spell. Oh.. And if you die by falling off a cliff? You lose your weapons forever, have fun.
Torchlight
Maybe my tastes have changed, but I used to LOVE Diablo and Diablo 2, but Torchlight, and then Diablo 3. I didn't like either of them and I can't place why.
Oblivion, and Skyrim
The most boring, corporate fantasy setting i've ever seen. Get a stereotypical stuffy buisnessman to write a fantasy setting and i'd imagine you'd get something similar to this. The entire world and lore feels so plastic and two dimensional, sure its massive but it feels.. stiff.
Gears of War 2
Cover based shooting can fornicate itself with a rusty iron rod. I can't say about the other two because I havent played them, but i'd wager I hate them too.