Pretty bad, no doubt, and I own every damned one of them. My daughter can sing every song from Barbie Princess and the Pauper...and she has lots of practice. Lots. And lots. And lots. Since age 4, so 4 years now.
As kid movies go I have an especial hatred for Chitty Chitty Bang Bang. Punishing. Most any of the newer Disney kid non-animated movie will set my teeth on edge, e.g. Air Bud and such. The older stuff like Treasure Island and Mary Poppins are pretty good but the others? Gack.