Deathmatch? Deathmatch is so 1990's. I can play deathmatch for 20 minutes at a time at a maximum. After that I am tired of it.
If deathmatch is 1990's, then 2000's is all about team deathmatch. Unless in an organized match, everyone plays these so-called tactical games that try to push teamwork down your throat like they're team deathmatch regardless.
I've been playing TF2 lately and even there, where you're restricted to a very specific role based on the class you choose, it's near impossible to find people trying to do anything other than mindlessly killing. The extent of teamwork does not go beyond "I'm a medic, I see a heavy or a soldier, and I'll heal them". That's it. Engineers camp their bases with sentries instead of trying for a risky forward base with a teleporter. When I play as engie, it's hard to get people to use my forward TPs because it seems people hardly understand what they even do.
Meh, I've experienced more teamwork in UT CTF than any of these post-CS boredom inducers.