>>91227976Aladdin and the King of Thieves and Cinderella: A Twist in Time were, I felt, legitimately good kid's movies even if they aren't as good as the originals. I'd tentatively say that Lion King II was pretty good also.
The worst of the sequels is a much broader category, but I think the absolute worst three were probably Cinderella 2, which wasn't so much a film as a bunch of not very good shorts, Mulan II, and Hunchback of Notre Dame II, which was by far the worst of them all.