I love gaming, although I'm not the greatest gamer. My favorite systems are the Sega Saturn and Dreamcast, and my favorite genres are Adventure games, some RPGs, Puzzle games, light gun games, 2D platformers, etc. Some of my favorite games are Quest for Glory 4, Skies of Arcadia, Super Puzzle Fighter 2 Turbo, Soul Calibur, Saturn Bomberman, Guardian Heroes, the Panzer Dragoon series, Castlevania series, the old Sega Genesis Sonic games, the Metal Slug series, and Capcom and SNK fighting games.
And I can relate to you in getting obsessed with a game. I remember back in the day when I was obsessed with Phantasy Star Online for Dreamcast (first online console RPG), and also when 56K connections were more widespread. It got so bad one day that my sister had been talking on the phone and I was yelling at her, throwing a stupid tantrum, because I couldn't play online right then.
I'm not like that with them anymore, but then again, I don't get to play too many games these days.