Also, the voip can be funny.
For most of the night I couldn't see that XXX had a mic nor hear him, then I couldn't hear bomber or zen.
As for gameplay, it's mainly just lag or something.
Like, seeing someone, unloading half a clip in them, seeing them turn, fire one shot, and you die. Then on the kill cam you see that they started shooting you long before you started.
Or shooting at someone who's quite a bit aways, dying inexplicably, then seeing they shot and meleed you.