IMDB gave it a 7.5 out of 10, which isn't bad, and Rotten Tomatoes gave it a 66%.
Before, or after, watching Thor: The Dark World, I would recommend also watching the "Honest Trailer" on Cinema Blend, which I think summarizes the film pretty well. "Honest Trailers" are a series of clips produced by the YouTube channel Screen Junkies as trailer parodies for various Hollywood releases. Along with the traditional summary of the movie, these videos clips include video commentaries that are witty and fun to watch because of their bluntness about the characters, plot, and movie scenes. This way you can know what to look for when watching or just laugh out loud about the movie.
Don't take my word for it, though! If you want an "honest" review of the movie, check out Screen Junkies.
Don't forget to tell us what you think about the "Honest Trailer" and Thor: The Dark World in the comment section below.