Leveling zerker is getting on my nerves. Ive been trying to get to lvl 6 for 3 years, but its so tedious i just stop playing for long long period of times.
But its just a fun game to just kill zeds. I think that is enough for me.
Left 4 Dead 2 on the other hand, the game itself really peeves me off just with its inexplicable hitboxes.