Loved loved loved this movie! First of all, the animation was beautiful, all the details in the buildings and the characters were perfect. The fur looked lush and each different ecosystem had its own character and feeling. It really is amazing all they were able to do with CGI, to not only create one world on its own, but several different worlds within that.
The storyline was excellent too, putting forward the message about not letting fear rule the day and how everyone traffics in stereotypes, whether they have malicious intent or not. It's a good message for a movie, because that is something that most people do, pick up stereotypes through society and not really even give them a second thought. The scene where Judy reached for the repellent when arguing with Nick at the police station was a great example of that.
Plus it was fun too! All the little puns and details in the background were great, with the signs and references, changed for animals of course. And the animation of the sloths was great.