While Doom's origins are too closely tied with the FF to separate them, I think the need for Doom in the FF movies has hamstrung them from the get go. The best FF stories are when they're treated as explorers and more science fiction rather than traditional superheroes. Dr. Doom, however, is a terrific, traditional Super Villain (always use caps when referring to DOOM!). As such, his FF stories are far more comic-booky than the best FF stories. My favorite Doom stories were always in Avengers, and I LOVED the part he played in the original Secret Wars. That is classic Dr. Doom.