I have the game for both Xbox 360 and PS3. I play with friends on the 360 and I am horrible. My kill ratio is 0.55 at level 33. I constantly find myself watching the kill replays and see me shooting off in some direction that wasn't at all what I was seeing before I died. On the 360 I aim and shoot and people don't die. On the PS3 my kill ratio is 0.87 at level 16. I can basically run and gun and shoot people easily and accurately. I'm using the exact same setup in both. I know the kill ratio isn't much different, but I just haven't played the PS3 enough since I've gotten better. My highest scores on PS3 have blown away my highs on the 360. Last night I played on the PS3 and I was about 35-20, kills to deaths. Tonight I played on 360 about 6 games and never had more kills than deaths, and my highest kills was 7, with me constantly saying "this is ridiculous".
Anyone else experience anything like this? Is there a setting somewhere that I may be missing? It is honestly a huge difference and not fun to play on the 360, but I do because that's where my friends are.