On PS3 it is mainly the same group of regulars (maybe 15 or so) but they are hardcore as I see them any night I go on there. It is unfortunate that as far as I can tell no one plays anything other than team death match or if you are lucky co-op campaign on regular difficulty.
I enjoyed AVP 2010, although going through the same levels as different characters got old very quickly. The Alien campaign was the worst offender. It took me two hours to complete. I did not enjoy A:CM though. The graphics were mediocre, the shooting was crap, it was literally a 'bug' hunt, the buddy a.i. was horrible and half the time you weren't even shooting at aliens, but Weyland-Yutani robots. Also, the big plot twist was downright offensive and, like the egg on the ship in Alien 3, impossible.