Yeah, I haven't had any problems with the game, but gameplay is awful. I agree with what someone else said in that the game just doesn't seem like its a big title game. Kind of has a cheap feel to it.
The last time I was really into computer games was the days of Wolfenstein enemy territory. I loved that game so much.
I was unsure whether or not to buy this game due to all the problems people have had, but I went ahead and got a steam key on ebay for ~$30, the key worked perfectly fine MP/SP.
Game itself has worked for ~99% of my playtime. I have had maybe two instances of stutter (no more than 1-2 sec duration) out of ~5 hours of game time. Right after the stuttering everything would be fine again. I can easily chalk that up to my computer at that point.
So from my limited experience, the game works well. The mechanics I am still too new to really comment on, but I don't find anything terribly out of line. (I'm all ears for overpowered pointers)
The game mechanics of (return to castle) Wolfenstein were laughable to me. I only played in the beta because it didn't warrant a purchase. But I can tell you of countless times I snatched the flag on w/e that beach map was in the beta, and hopped my way to victory while spamming med packs to myself. Hopefully they've tweaked things since then. Can't comment on enemy territory other than the fact it was released as freeware cuz they did such a bad job on it.