I downloaded the MW3 multiplayer from Steam for this weekend. I've played it a bit for a bit, but it hasn't really grown on me. I'll play it some more until the time is up, but don't think I'll purchase it.
I'm a BF series player at heart. I like the open spaces and vehicles in BF3. MW3 is a bit confining for my tastes and I don't seem to stay alive longer than about 15 seconds or so. But I gotta give MW3 credit, every time I started the start it, it loaded okay with no black screens or other bs that's found in bf3.