The "origin" piece of the storyline was perfect. Other than Spiderman, it's the superhero movie that most closely mirrors the real origin of the character (from Tales of Suspense #39, 1963).
The rest of the movie obviously accelerates from there to mesh the original Marvel universe with the Ultimate Marvel universe, but it was a very very good representation of both the Tony Stark and Iron Man.
The appearance of Nick Fury after the credits was entirely expected, not only because Stark and S.H.E.I.L.D have been connected for years, but because the "Utimate" Nick Fury was actually created from Jackson's likeness and with his permission. Tony Stark should also show up in the next Hulk movie as well as part of the "Avengers Initiative" backstory, possibly to scout the Hulk as a potential member.
Good times right now for Marvel Studios and comic book films in general.