The original MADAGASCAR wasn't exactly brilliant filmmaking, but for a kids film it was passable entertainment, and surprisingly funny.
The same can't be said of the lame sequel, which seems to have been conceived very quickly (although it took 4 years to reach the screen) and probably needed a few more rewrites or a direct-to-video release to lower expectations. Characters that were funny in the original are just annoying here.
The animation is pretty weak, although they were stuck with the style established 4 years ago. The characters are predominantly 2D with a few 3D features, which doesn't cut it any more, even for a kids film.
Recommended as a rental only for the youngest set.