First Person is just a perspective. Most shooter games are first person. Medal of Honor is a Run n' Gun game; a game where you pretty much just keep going through the stage while shooting at anything that moves. A tactical shooter type of game takes time and strategy, you can't just run through the level and shoot, you'll have to go slowly and take out your targets according to the situation.
Run n' Gun games: Halo, Halo 2, Medal of Honor, Battlefield 2, SW: Battlefront, SW: Battlefront II
Tactical Shooter: Ghost Recon, Counter Strike, Rainbow 6 series