i don't know about you, but crouching in a WIDE OPEN SPACE in any other vidya is the stupidest thing you can do(sure you are a smaller target, but you aren't really moving either). but in gta, with auto aim on, it seems to work. when the auto aim is off, you can afford to lose a little accuracy if you use terrain to your advantage and or move around like a little bitch.
also, deal breaker, and bomb da base 2, are fuck awesome to play with a friend online.