I would lukewarmly of recommend it (coming from another "older teen"), but probably more as a rental thing. The script is pretty funny, but there's not much in the way of story or characters. In fact very little happens story-wise, other than a conflict quickly tacked on at the end about Alex the Lion and the food chain, which never really seems appropriate. (is it me or is he just on a steak withdrawal?) The characters are likeable (especially the penguins) which helps considering there's no depth to them. The giraffe and the hippo are significant characters, but don't have much of a personality. And the foosa are completely useless... Madagascar's not really a bad film, but I think it's crystal clear by this point that Pixar entirely dominates computer-animated entertainment, in terms of quality, as the only thing that maybe even begins to come close to their level is the first "Shrek" movie. (and even that is dubious...)
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Lather Rinse and Obey!