I played so much AvP2 MP, seriously top tier game.
AvP2 had the most bad-ass gamemode of all - but i don't remember how it was called. Survival-something.
You had one team playing as either the marines or the corporates, the other team as aliens. Marines started out in larger numbers and had a minute to prepare. Then the aliens spawned and attacked, respawning after death. Whoever they killed, also respawned as an alien. The objective was for the human team to survive as long as possible.
Was freaking awesome, with all these random players working together, fortifying in groups in defensible positions, then waiting patiently, rifles at the ready...
Actually, you start out with humans only and it's deathmatch. When the first player dies, he spawns as an alien, and it goes on from there. The marines could actually get a team win if they beat the clock, otherwise the winner was the last man standing.
My other favourite game mode was Hunt.
>one or a few preds
>lots of humans
>only pred gets points for kills
>whichever human kills the pred respawns as pred, dead pred spawns as human
All dat stalking. Amazing atmosphere.
Hunt was also very fun as Preds vs Aliens. They can see you and they're fast, deadly, looking for melee, so instead of stalking you break out the big guns, all discs and plasma. Trying to find the right time and place to recharge your energy, or desperately fending off charging xenomorphs with your spear. Good times.
And yet 70% of the servers were always retarded 4-team DM or TDM. Pointless unbalanced bullshit.