Well, to be honest, I haven't seen him not able to do anything in the movies (except stop the Hulk and he has just as much trouble with that in the comics). He doesn't seem all that physically weaker to me. He just hasn't lifted an apartment complex over his head yet. In fact he shattered the Bifrost Bridge. A feat that's supposed to be so powerful that it's one of the signs of Ragnarok.
Has Thor even been knocked unconscious in the movies? I'm convinced he can't be and that everything short of stabbing him with an Asgardian blade just irritates him.