Well on Wednesday I got the Pyschout achievement for Crackdown, and my neighbor announced his intention to buy the game.  Also, yesterday I downloaded the Halo 3 Beta.  Now, I've never really been a fan of the Battle Rifle and now I find it almost completely useless.  The missile pod is an interesting addition, as well as the shield grenade, portable grav lift and trip mines.  Picking up, and carrying around, turrets is fun too.  However, on the whole I'd rather just play Crackdown.