Mic-Nificent
I didn't eat nobody
technically, they did.
Not even technically.
Other studios bought the film rights to those characters and made movies about them. Marvel had very little say so about how those movies are made.
The Marvel Studio films are:
Iron Man
Incredible Hulk
Iron Man 2
Thor
Captain America: The First Avenger
The Avengers
Iron Man 3
Those are the only films Marvel has actually made themselves. All the other ones were developed and distributed by other movie studios. In fact Marvel has been slowly reacquiring the film rights to their properties. They just got back Blade, Daredevil, and Ghost Rider.
Fox still holds the rights to the X-men characters and the Fantastic Four.
Sony still has Spider-Man.
As long as those studios keep making films based on those characters on a regular schedule they can keep them.