I actually played assault a few nights ago. It's not as terrible as I remember. I had a good time jumping into vents and getting headshots on whoever camped at the end. I probably got awped there just as many times, but meh. Still like office better.
Assault sucks if you're CT. You actually get a challenge. Any map where I actually have to focus or not be a moron to win is stupid. It's too much work.