Nobody is "against" you, it is still too early to judge. I find both extremes, sometimes on the same server. Last night the opposing team was using teamwork and my side was running around w/ their heads cut-off, the rounds didnt last long.
I have to agree that teamwork is not as popular as lone-wolfing at the moment, but a lot of folks are still just exploring the game.
Find a sever w/ a lot of clan members and pick there side, those guys are almost always working together.
Cheers!