I had a roommate who tried to get me to play the first two for years, and I just never got around to it. if the first two are as broad and open as this one, I'll probably just stick to wikis for the past info ^_^;; there are a lot of games to play, after all.
Also on a side note, I don't know if I could ever play through and not blow up Megaton. Everyone in that town (except Gob, I suppose) is just so rude.