The Lego Movie is a fun, funny movie. It's a "family film," in the good sense of the term, it's a film which the entire family will actually enjoy. It's bright, colorful, and funny to hold the attention of children, but it's still smart enough with it's humor that you can enjoy it as an adult. I don't remember the last comedy I laughed as hard at.
The animation is great, the story is solid, I can't think of a joke that didn't land, I'm honestly not sure what there is to not like about the movie.