After watching "The Avengers" last Saturday (May 19th), and thinking about it this past week, I've come to the conclusion that Thor was somewhat emasculated so he wouldn't seem to be too powerful compared to the the others.
But first let's look at the other members of the The Avengers:
Okay, Black Widow and Hawkeye can be eliminated right off the bat since they have no super powers.
Captain America's only real "power" is in his shield, which I will come back to.
Ironman's power is in his suit and his ability to fly and destroy things with it.
The Hulk is really the only "super hero" whose powers can come close to Thor's. Hulk's strength, his virtual invulnerability, and his ability to "leap tall buildings in a single bound" are his only tools.
Thor's powers include almost total invulnerability, his strength, and of course, Mjolnir, his hammer. With the hammer, Thor can bring down lightning, then direct it wherever he wants.
(A single lightning bolt can travel up to 140,000 mph, with a temperature approaching 54,000° F., with an output of about a trillion watts! http://en.wikipedia.org/wiki/Lightning#Properties ).
He can spin it around until it has the momentum to let him fly. And it goes wherever he throws it, it never misses, and it will come back to him. (Norse mythology says it can cause mountains to crumble.)
In the movie, he did all of that - he directed lightning to strike Ironman (with less damage than there should have been). And he used it to knock Ironman back a few dozen yards, or more. He also grabbed Ironman's armored arm and began to crush it, proving his superior strength.
He also caught Hulk's fist and stopped the punch, so that proves he is stronger than Hulk. In fact, all he would have to do is lay the hammer down on Hulk's chest (as he did with Loki in the "Thor" movie) and Hulk would be helpless to get up: when Hulk tried to pick up Thor's hammer, his feet began to break through the steel decking of the aircraft carrier they were on.
Early in the movie, Thor slammed his hammer down on Capt. America's shield and the result was a tremendous shock wave that felled dozens of trees, if not more, all around them. But neither Thor nor Capt. America seemed fazed.
But even if somehow the shield was able to withstand the tremendous crash of Mjolnir , and not break apart or be crushed, the force of the blow should have driven Capt. America deep, deep into the ground, and should have killed him.
Is Thor really that much stronger than Hulk?
Is there magic involved in Thor being able to wield Mjolnir so easily?
Or is Thor's magic the result of Asgard's technological advances, and it only seems like magic to us?
But like I said at the beginning - Thor couldn't be seen as TOO super-powered, otherwise the movie would have to be called "Thor and the Avengers."