Hmm, I've had some big disapointments with games, but the biggest letdown would have to be Spiderman: Web of Shadows (PS2 version)
It was ****ing terrible in every way, while every other version was 3D roaming, the PS2 one was a direct PSP port, the gameplay was a shockingly bad 2D platformer that belonged on the NES and the plot was worse (the "ending", if you wish to call it that, was just a tiny box that popped up after you beat the last boss that said "Well done, you saved the city" or some crap like that) and the "Amazing Allies" that were praised on the box were totally useless, not to mention the game was really short. As in, finish in 3 hours short. I returned it the next day, very annoyed.
TMNT: Smash Up also deserves a mention, I played it the other day, it is a piece of utter trash. Good thing I only rented it...
Punch-Out
06/11/2009 / Melbourne, Victoria SSBB FC: 4038-8950-2069 Platinum FC: 2750 9999 8708