I've had that experience, I bought MW2 to play with friends thinking I'd like it to SOME degree. But I don't, they say team deathmatch but there's no team work at all, you're just shooting at half the people on the map instead.
There's no teamwork period. I won't compare it against it's biggest competitor BC2, but let's use TF2. In TF2 you have assault classes, sneaking classes and support classes, all of which make for great teamwork because you can have people helping others like recovering health, building an assault. TF2 you can be a medic and heal, be a pyro and keep people from getting stabbed or reflecting rockets. While none of this is realistc there could still be medics who assist in the game by giving stim packs, reviving a teammate and more.
In MW2, it's run out, die, run out die, or camp whatever you'd like to say you/they do. There's no teamwork in that game because because your instakilled so you're fairly limited to Jeff was shot from the left, so there's a guy there, let's go shoot him. Well in reality you're sitting next to Jeff when suddenly you're hit by a noobtube and any plan is out the window. This is where you respawn into the gunfire of an AC-130, now you hide inside while the enemy team does the same thing waiting for you to run in and shoot you.
