I remember watching animal movies which were actually really fun. Zookeeper is mostly a cheap way for a funny movie with animals which reminds a lot of Night At The Museum.
I do not say, it was not fun but it was predictable in a way that make me feel like i've watched it before. The animals decide to talk the zookeeper and help him get a girlfriend in their own way. The fact that he actually listens and does what animals do to mate, was really "nahhh....". It's a movie that can't surprise you if you grow up watching comedies, animals movies.
As for the acting it was really average. Kevin James was trying too hard to be funny and in conclusion he was just silly. I don't believe he is such a great actor but in Grown Ups he was really good. As for the voices of the animals, while some of them were matched other fell out of place and not real.
While the movie could have been way better, it seemed to me that they didn't really put much effort in. It's simple okay...though i do believe kids will like it way more.