I couldnt resist, I bought Condition Zero a couple days ago, just to play the beta. I had trouble connecting to servers at first, but realized rather quickly that it didn't like WinXP Firewall, even though I have Steam on the Exceptions list. It looks like a crash, and the only way out of it is to press CTRL-ALT-DEL and then ESC.
Anyways once the firewall was disabled I got in, fixed my Buy Scripts to work with CS:Source and had a blast. Game plays great, looks great and is alot of fun. The physics really add a nice touch to gameplay, especially when you can make use of a barrel or debris to throw off your opponent.