Medal of Honor Spearhead was the first game I got into religiously, played it all weeknights and nights, It was very buggy but such a fantastic multiplayer and a brilliant community, and made some good friends.
Next came Desert Combat and I got in with the Desert Wombat possy, that game was good, people used to say "yes I've been playing CS since the beta" and its really the best to follow a game through its development and to have the game reinvented every patch.
Then Battlefield 2 last summer, that game took up all my spare time, I remember being one of the first to reach Sergeant, then they changed the ranks
People will still remember me being the bunny hopping - GP30 - Tank whore
About the same time I got into EvE Online and life as I knew it changed, for the better or for the worse I'll find out later in life, but the game is so immense I'm still learning and seeing new parts of the game nine months in with three characters, and with new content every 6 months I really can't grumble at the bugs with it offering so much else from PvP to the politics, industry and logistics.