If you want to see Alvin changed to a better person, here you go. This movie gives me tears while watching it, especially when they were isolated on an island, and Dave was not there with all 6 of them. Simon changed to Simone after being bitten by a spider, and Alvin changed to someone who took responsibilities very much.
Anyway, previous Alvin & The Chipmunks movies were still the best. Lots more fun and laugh. This one was funny, but not that really funny. I found Theodore was very cute in this movie. Hell cute! This movie was good, and it's worth to have some laughs at the cinema :)