I got in the beta of this game a couple of days ago and so far it's been one of the most fun experiences I've ever had with a multiplayer game. It's similar to TF2 but there's just so much more focus on teamwork, even a high skilled player won't go on a rampage without enough support.
Here's a review that pretty much sums up my feelings about this game: http://www.preview2review.com/archives/657
You can get a beta key by making an account in the official forums and posting in the following thread: http://forum.primalcarnage.com/viewt…t=5175&start=0
Right now it's still in closed beta so expect stuff like random crashes every now and then, but you won't be dissapointed once you get a match going.