Destoy All Humans: Big Willy Unleashed, less said about that game the better. There isn't a whole lot of games I regret buying, there's definatley more but I just can't think of them at the minute.

If it were about consoles then it would definatley be the Wii. Waste of £150.

Bad company 2. hated it.

Tomb Raider Underworld for PS3.  Sucked big time.

Assassins Creed. I can't describe my feelings for that thing without getting banned.

Rogue Squadron III: Rebel Strike (GameCube)

Pokemon Battle Revolution (Wii)

Castlevania: Lament of Innocence (PS2)

I'd have to say Crackdown 2.  It was probably the biggest disappointment in years for me.

I never regret any purchase. When money is spent, it's spent. I never look back.

I have the same mentality, I do not really ponder on anything I've bought ever. But you have to come across stuff sometimes thinking why the hell did I buy that???