I will keep this one short, too.
There's wasn't much to add to the first Ice Age that more or less said it all about soon-to-be extinct animals in comedic ways. This sequel isn't very funny because Denis Leary's Diego is just too reformed. Queen Latifa is the voice of a female wooly mammoth with severe identity problems, but even that doesn't save the film.
But the squirrel and the acorn makes the films so darned funny; keep your eye on the acorn.