Yes, stay through the credits at Iron Man. If you like The Ultimates you'll be glad you did. If you like bad-ass muthas you'll be glad you did. If you like both you'll be glad you did and give a "Yeah!" with the rest of the geeks.
I'll write on the movie in detail later, but I can say right now you gotta check it out. Solid movie if you like comics or not.
In celebration of the director I'll use my Gutter pic. =D