Whiteblade999: -Borderlands (Repetition and that horrible ending)
Oh, yes, I can't believe I forgot this one. It pretty much only had four kinds of enemy in the whole game, none of which were dynamic enough to stand up on their own. Lots of repetition, a boring-ass world without much character (hardly any voice acting). Lifeless towns with only this irritating-as-fuck claptraps to keep you company screaming "WELL HELLO NEW QUESTS ARE AVAILABLE ON THE BOUNTY BOARD" blah blah. And the weapons barely gave me a sense of progression, in spite of the fact that there were 25 million of them or whatever.
I also typically found the class abilities pretty middle-of-the-road kind of stuff. It was marginally improved by co-op multiplayer, but I can't help but feel that it succeeded neither as an RPG, nor as an FPS.
I'm sure there are other games which should be on my list, but I usually spare them very little consideration after getting bored with them, so I'm having a hard time thinking of them. Oh, wait, just thought of a whole category of games:
Button-combination fighting games like Mortal Kombat, Street Fighter etc.. I simply cannot be bothered to memorise the sequence of a dozen or so keypresses to pull off a certain move. More often than not, I was able to simply beat my more experienced opponent by button mashing. I don't find these that fun, preferring Smash Bros.