I use the machine gun as much as possible I really enjoy the uzi, as well, but its short range limits its use. The rocket launcher I save for special occasions, such as groups of machine-gun guys. The shotgun guys are fun with any weapon, because they come in close before shooting

I really like the shotgun, as well. I save it for close-quarters battle for obvious reasons.

I don't know how you're doing the AI -- I like it, though. I like leading them one way and then coming around from behind, but in the end it doesn't give me any advantage because they turn around instantly -- it'd be nice if their "cursor" (if that's how they work) had a "max speed", or they were somehow given a bit of a delayed reaction-time like humans do, so we could surprise them from behind if they thought we were somewhere else.