Heyyo,
UT2k4. One of the best mp games, perfect for lans. Epic did an incredible job onnit, they listened to the community bigtime. built in IRC chat functions, stats, multiple channels for voip, and does it take skills to pwn bigtime? yes.
CSS is soo much easier than CS1.6, but it has to be to make up for the crappy hitboxes I guess.. valve should fix this game, it currently turned out to be a half-decent port of a classic... I think I might actually have preferred DODS over CSS...
Half Life 2 has pretty good DM, but it gets rediculous lag when more than 4 people start shooting off their guns... and that rocket launcher... laser guided n00bcannon that deals out too much damage.
BF2 turned out great for mp. Once players become more skilled with it I'm sure the matches will start to become better since the game's very balanced.
H2 is pretty lame I say. It's a spamfest. a dual-wielding spamfest. Too easy compared to H1.