1. Idiots taking advantage of bulletproof rear windows, knocking me down and gunning me down.
2. Obviously tankers.
3. Cretins that are too insecure to actually fight me and get up high and snipe at me. Jesus, even if I manage to shoot those buggers down they'll still respawn in that said high area.
4. People that open fire for no apparent reason.
5. People that randomly honk at me to get in their cars with absolutely no idea on what they want to do, I mean, it's nice they don't want to shoot me down but this is almost as equally as offensive.
6. That annoying, generic and very common pair of late-teenaged lad and pre-pubescent boy that won't shut up on the mic and always talk about the craziest crap.
7. Spawn-killers. Period. The #1 rule in any battle is to have respect for your opponents.
Well, that's all I got, care to sound off what some of yours are?