Loads of people are complaining about MW2 Favela on Veteran. It wasn't THAT hard! Try finishing MW1 on Veteran. Jeezz.
Anyway, GoW: Chains of Olympus on psp. It's been a while since ive played this, but I remember I had saved my game at the very last save point in the game. I didn't know it was the end, so I saved over my main file. Oh boy did I regret that. Having to face the end boss with 10% health is NEVER a good idea.
Oh, and another psp game. Guilty Gear XX Accent Core Plus. Try beating I-No with ANYBODY on ANY difficulty. FUUUUUUUU-
Honestly, when you think you've got her, she does that screen obliterator that takes a good 60% health from you. As the onslaught comes in different patterns, some are impossible to dodge. Even if you get lucky, she'll do about 3 or 4 of them until you ARE dead.