So far this year, I've returned. 

Battlefield Bad Company 2, Modern Warfare 2, Assassins Creed 2 and Blur. Fortunately Gamestation don't mind accepting new games as returns rather than exchanges. Meaning I was able to get a full refund purely with the reason 'I didn't like it' and swap them for something I did. 

The only games that are actually still in my collection, that I dislike. Are Socom Confrontation, and Warhawk. Warhawk simply isn't to my taste. I don't really like the game, it's too 'assisted', everythings revolves around lock on targeting, and the controller deadzones are higher than accepted standards, and Socom is just too slow paced for my taste. Neither of these are worth exchanging considering how little they're valued. 

Although I didn't want to post in this thread because it's old, I still will. I'm fancy.

I totally regret buying Borderlands.

I also regret buying God of War 3 first day since I haven't even played it yet and I've seen it at 29,99$ since  -.-

Then quick, you must play it before it gets cheaper! :P

I have played a ton of bad games. Too Human, DMC4, and Assasins Creed are recent ones.

That's actually what I'm going to do and for that exact reason lol

haha, yeah lost was awful... I agree great show but horrible game

and dragon age, it was so bad it made me question whether I even liked playing games, oblivion was so boring me and my bf at the time had to play in one hour alternating shifts and i thought that was as bad as an rpg could get..., but D.A was simply horrific, I will probably avoid all western Rpg's because of it and I consider that dodging a bullet (as at least I still play some games)

I had a horror show with ps3 exclusives for a while, all of the following were major regrets

-Heavenly sword

-Uncharted (i dislike 99.9% of any type of shooters but I foolishly bought it thinking it would be like tomb raider)

-Heavy Rain (luckily a lot of good games released around the same time as this one so it wasn't as bad as it could have been, I played it once, hated it, went online and read everyones shining reveiews, got very confused if we wee playing the same game, so went through and completed it again (this time killing most charactes out of a lack of caring, then realised i just really didnt like it and returned it at full value in the Eb games 7 day return period.))

Though I think they are the only regrets over my whole gaming 'life' I can generally avoid what i know I won't like, these are the few that got under the radar

Super Monkey Ball: Step N Roll (Terrible controls)

Wario Land: Shake it! (Too hard to do 100%)

Wii Fit (Good, just not worth asking price)

Link's Crossbow Training (See above)

Animal Crossing: City Folk (Sucked me in for the whole 2009 summer when I could've been partying)

Only one I really hate is Art Style: Rotohex. there are some others, but none as bad.

Haze

I thought it's always good to own another co-op shooter. Problem is...none of my friends want to play it with me because it seriously sucks...

don't hate on Lost Via Domus. Short but sweet.