Like the first movie, this one also is a quite nice family-friendly movie about cute stuff and how families and friends should support each other.
The main theme is "highschool comedy", with all the many tropes you're used from highschool movies, but of course silliness instead of horny teenagers. :-D
When it comes to humor and dancing, it's very close to the first movie, which I consider good. It does have some advantages over the first movie, though:
Thus the movie teaches much of responsibility towards family and friends and how you have to find the people you really belong to.
Once the movie turns from a highschool comedy to something a little more serious with dangers and chases through the city, the full strength of the Chipmunks and Chipettes constellation is shown and makes for a fun and enjoyable second half or last third.
The only things I did not like:
Toby Seville, the human main character is...not really important. A very cheap stereotype of a "good for nothing" gamer that only gets character development in the very last bits at all and could've easily be ignored in the movie completely.
The typical highschool bully which plays an elementary role in the story, but is over-the-top asshole and can be exhausting in some moments.
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Like the first movie, a nice family movie about supporting your friends and family with the Chipettes as a great addition.