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Crysis Multi-Player can be fun, it is a more "battlefield" style than CS (although there is an "instant action" deathmatch mode). It keeps the customisability that there is single player mode, and the currency to buy this is gained by capturing points and killing people (and depends on how and who you kill).
Honestly though, If you just want the multiplayer, I'd go with TF2, it is very fun, light-hearted but still has skillful elements.
I feel TF2 is a bit fo a mess. I'm sure there is skill too it but when I played it there seemed to be none to it, even I got a good score. Its just mayhem, people running all over the place. Different say from CSS as that has a more tactical element.
For me, CS was my favorite game until WOW. And, what I loved most about WOW were the battlegrounds until they stopped giving experience. Changed everything and ruined the tiered grounds. Haven't really found a multi-player that I like since. May look into all of these.