If you boiled down Marvel's movies to a basic formula, the first Thor film would be a perfect example of it. It's got some decent superhero action, a lot of shoehorned-in S.H.I.E.L.D. stuff, and one huge feather in its cap: A sense of humor about itself and its characters.
Luckily, the new sequel, Thor: The Dark World, is like its predecessor in that it's not afraid to include some levity. As long as that keeps up, it's a jaunty, enjoyable flick. It's only when the movie gets capital-s Serious -- and luckily that's not too often -- that it gets into some trouble.