All I have experienced so far is frustration. Spent 15 minutes trying to get into a game for it to crash on me straight away and then another 15 minutes before getting into another. I tried to change controls but I was killed halfway through which then booted me out of the options screen (is there a way to do this without being in the game?). Finally got the controls done, ran around and found some bad guys, killed 1 and then crashed.
I couldn't bind anything to mouse 4 or 5 either. A very disappointing start so far.