My cousin really liked Wolfenstein. I played it some because he had it. You're right about Doom, though. In fact, I'm pretty sure that it is considered to be the game that put first-person shooter games on the map, so to speak. Isn't that right?
My first shooter game was Goldeneye 007 for the N64. It was my favorite game at the time and I spent hours playing it with my friends, this game is the reason I started playing games like Halo and Call of Duty.
My first FPS that I played was the original Counter Strike at an office LAN party (back in the day). It was awesome. From there, the first shooter I bought was Unreal and all the subsequent releases afterwards. I still play Unreal 2004 all the time (even though I suck too bad to go online with it). My new favorite is the new Team Fortress.My favorite First Person Shooter is Counter-Strike. Even though a lot of people complain about the graphics being bad (which is kind of true), I think it's not the kind of game you play for the graphics. You play because it's fun, and you'll never get angry after the game. Once you find a server with people you like (for me it was a server from Quebec, where I live) and add it to your favourites, you'll get addicted for the rest of your life.
What was the first shooter you were really into? I thought Wolfenstein 3D was decent, but I consider Doom to be the best classic shooter. It was one of the first PC games I really became addicted to.