It isn't CSS 2.0, they focused too much on making graphics up to date, now it's clunky as hell and the guns are terrible. CSS graphics were perfectly fine yet they tried to do what most FPS game companies do nowadays and focus on graphics instead of the core foundations of the game. I had high expectations for the game but once i saw how they butchered such a great game i was pretty pissed off.
Oh well, not going to argue about it, people have different opinions.
I recommend TF2/Css/WoW Arena!