The Mighty Thor does not require a puny mortal origin story.
Superhero movies remain hot stuff in Hollywood, and we’re all going to have to accept it. Some of them are good, and some of them are bad, but one thing is certain: There are too many origin stories. Since studios would like to turn every superhero into a franchise, the first film in a theoretical series has to introduce and explain everything. And it all becomes rather tiring, because while the details are different, the song remains the same: Average guy (usually a nerd) lives his regular life until a life-changing event turns him into a costumed vigilante.
Spider-Man, Batman, and Iron Man have all done it with great success. Green Lantern and Captain America are going to try it later this summer. Regardless of the quality of the actual film, it often ends up feeling like two hours of setup so the second movie can get moving quickly.
But Thor isn’t an average superhero. He’s not some schmuck who suffered through a trauma or got exposed to the good kind of radiation. He’s a god. He’s been flying around and smashing people in the face with his giant hammer for thousands of years.