is it choppy and slow in some places for you guys too. when i drive and shoot it always seems to slowdown 

I've noticed it a little bit, but very little, not enough to affect the gameplay. usually when theres alot of cars on screen at once!

ye i noticed it..too

I noticed it during the shootout at the very beginning of the game.  I came across an area with what seemed like 20-30 guys and it just chugged...

Also, while watching the opening credits / cut-scene, it would jerk and stutter.  It then lasted forever on the Loading screen before I turned it off.  Hopefully when I try again, it'll get past that loading screen.  I got my game used, so it has a bunch of scratches, so that could be the reason it hung on the loading screen...

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1st Xbox 360: Born on May 6, 2006 Died on October 16, 2006
2nd Xbox 360: Born November 2006 Died on October 6, 2008