My favorite MP game was AvP 2 on PC. I was so ridiculously good at that game. I was even in a clan. They used me as their secret weapon, I would play Predator at the beginning of the round and then Jimmy would tell me "now" over chat and I would switch to Alien. I was a fucking monster as Alien. I could kick ass as Human or Pred but you put me in the driver's seat as an Alien and I was fucking homing missile of death. I won my clan so many games because of that strategy. I miss those days.
The night I got in the clan was a funny story. Didn't know what a clan was because this was back in the super early 90's and I didn't game online much. The tryout was at the end and the guy running it told me I couldn't get a spot. With in around ten minutes I had about fifty kills as alien.