What movie or TV show did you dread, only to wind up loving it?

Sometimes you can see a trainwreck coming from a mile off... only to have it arrive and turn out to be a wonderful train ride instead. What TV show or movie have you been convinced you would hate, until you saw it and fell in love instead?

This question was inspired by commenter Nathan Ford's Evil Twin, who points out the universal critical praise being heaped on The LEGO Movie, and asks, "Has there ever been a movie so dreaded from the concept that turned around and became so embraced by everyone?"

Please include a picture, clip or poster for your chosen TV show or movie. And please mention the name, why you dreaded it, and why you changed your mind. Thanks!

Top image: Terminator: The Sarah Connor Chronicles.