I just played yesterday... it's hard to stop playing because it's very replayable and it looks pretty..
Yes yes, I need to find a pwnzor team to join, add me on SF: dpsaves.
kinda off the subject, but is it just me, or does L4D look SPECTACULAR for being on the source engine? I was pleasantly surprised how good everything looked. I expected much much less because there would be so many characters/zombies in one place, but it looks so clean... (I'm running everything on the highest setting/with AA).