Ok, so that's 58/58 achievements earnt, and that's survival done. I might come back to it once in a while.
Onto the other versus campaigns, from what i've seen(cause ragequitters dont let me see more) dead air and death toll are quite difficult if the opposing team has a clue. However this being said, alot of people leave at dead air 2 due to the fact that its on a roof top
Left 4 Dead seems to be over for me, don't know for sure though.