-The cost
-I only get to play a real game once a month if I'm lucky
-"lazy airsofters" i.e. those who just sit behind cover and take russian corner shots all day.
-"timid airsofters" i.e. those who are too afraid to advance, to attack, or basicly do anything other than sit behind cover and avoid getting shot.
-The version 2 gearbox
-Parts compatability is bull****
-The cost
-People who don't call hits
-The fact that there are no cheap FALs, M1 Garands, FNCs, K98ks, Mosin Nagants, PSG1s, CA33s, Beretta M12s, and full sized uzis. I can go on, but companies should branch out and stop making repeats of the same 5 guns.
-M4s
-Magpul
-Magpul-ized M4s
-When people put expensive flashlights and tactical **** on their gun in broad daylight.
-The cost
-The fact that there are no trishot shotguns that aren't M3s or M1014s (even though I run an M3 as a primary, I'd really like to see more variation. Perhaps some mossbergs or remingtons)
-The cost
-People who panic and shoot you point-blank with a high-powered sniper rifle. Still got a mark from that one, and that was well over two years ago.
-Did I mention THE COST?!
I'm sure there's more but I've covered everything I can think of off the top of my head.