Also, Doom 3 is actually a good FPS game. Not as great as it's predecessors, but it's definitely a worthy successor that is still many times better than most FPS games that follow the COD forumla, which Doom 3 doesn't.
Also, I've heard Doom 4 is going to be alot more faithful to what made the original Doom games great. Considering how good the latest Wolfenstein game was, ID software could reclaim their title as the kings of FPS with Doom 4