I really don't know what most of the other reviewers are talking about. Compared to the first movie, this one wasn't a really good sequel. It does have a couple of good lessons in it, but overall I find it to pale in comparison to its predecessor.
I mean, to each his own; I'm not condemning anyone for liking the film, but I feel as though this one was a rather sketchy sequel. The ending makes no sense when you consider everything that the characters went through during the plot, and I find that the animation quality is not as good in this movie compared to the first one. Of course, I'm not really capable of animation myself, so I really have no right to be a critic; I'm just saying that I think the quality of the first movie is better than that of this one.
Oh, as an afterthought: I find that there didn't seem to be enough voice actors for all the characters; there should have been more dialogue among the rogue alphas.