Skip it. Of all the movies I’ve thought don’t deserve or need a sequel, it’s hard to come up with a better example than the first Rio movie.
What Works: Things mostly run in place for all the characters from the first movie, so there’s really nothing new going on for them (that matters by the end of the movie, anyway), and that leaves only two truly significant new characters for us to get interested in: Bruno Mars’ crooning uber-macho bird, and Kristen Chenowith’s lovestruck poisonous tree frog. Chenowith’s tree frog is the best thing in the movie, she’s colored vivid neon purple and black with eyes that dart between infatuated and homicidal.
What Doesn’t: Zzzzzzzzzz…don’t go into Rio 2 sleepy or you might not be able to keep your eyes open.
What I Would Have Done Differently: I can’t overstate that the first Rio did not need a sequel.