GoW3 is one of the reasons I bought a PS3 (along with FFXIII and KHIII (God I hope the latter gets announced). I've been waiting for its release since 2007 lol.
And yeah, some of the challenges are really difficult, I remember playing through the last challenge in GoW2 where you have to kill the enemies without getting hit, after 4 or 5 tries I did it . But it was a long time ago, now i really suck at the game.
well if there a trophy to do that challenge then im going to do my best i hope its a gold trophy