Wow I was surprised to see so many PC users, its cool to see the game's roots are strong...
is it because of all the nitfy mods I keep hearing about?
Very likely. Speaking for myself, the mods add to replayability, as well as help bring back elements from earlier games that didn't make it into the final published version (see: Classic Fallout Weapons or Cats Paw Collector's Edition for FO3 as examples). Not trying to sound like I am putting console players down, but from the folks I know IRL, console players tend not to replay games very much once they have beaten it once or twice, unless it's a multiplayer FPS - PC game players tend to keep finding reasons to fire up their older games and find new or different things to do in them.