Tony Stark is an engineering genius, Bruce Banner got radiated by Gamma Rays, Henry Pym invented a suit that shrinks him down to the size of an ant, and Steve Rogers is a man who signed up for the Super Soldier program. They all have something to do with science. Thor on the other hand is an immortal with a giant hammer, long blonde hair, and is a norse god. How is that going to adapt well on-screen with all the other characters? Unless they pull a lot of creative licenses on him, making the only thing similar to the comic book Thor is the name.