As advertised, Iron Man was AWESOME and Robert Downey Jr is amazing. Two non-spoilery comments:
Awesomness: Brass Rat screen time!
Annoyingness: You cannot graduate summa cum laude from MIT! Nor can you graduate magna cum laude or cum laude or ANYTHING FREAKING ELSE. LEARN IT, LOVE IT, HOLLYWOOD.
(
sirrogue started laughing as soon as they mentioned the summa cum laude thing because he knows what a pet peeve it is for me. I shook my fist at the screen.)