First, has anyone here beat any of the campaigns playing either single player or co-op on expert level? I gave it a go a few times with the old lady and we only managed to make it to the first safe house on No Mercy. On the subway section the Tank usually came through to beat us down, quickly. It seems like one would fare better with a full team of humans that could be completely coordinated in every move. I mean the A.I. characters aren't bad but there are times when they do things that seem to hurt the team, but then again so does my wife.
Second, how funny are some of the things the characters say. The other day I heard Francis tell someone not to stare at his ass or to stop staring at his ass or some shit like that. Another time Zoey kept yelling " Almost there, almost there" like she was about to nut. Funny stuff. I think Francis is the funniest though.
Lastly, the game is fucking fun as hell.