The thing is, so many of Disney's movies really are pretty mediocre when looking back. I'll say that I think Sleeping Beauty is absolute perfection to this day, and Snow White was a revolution in filmmaking (although I find the whole movie a little creepy), but Cinderella has just an okay score and I never was a huge fan of Peter Pan, Jungle Book, Bambi, Dumbo and a lot of others. Everything they made in the 70's and 80's is absolutely dreadful (especially The Black Cauldron, which scarred me as a child), although i did enjoy Aristocats.
As for the Renaissance, The Little Mermaid, Beauty & The Beast, Aladdin and The Lion King are all fantastic and truly worth being listed as among the best. Pocahontas and Hunchback, while having some occasional bright spots and a few great songs (Just Around the Riverbend being maybe my favorite Stephen Schwartz lyric of all time), they are just okay movies. I have a soft spot for Hercules despite its plotholes and for Mulan, because I think both have great songs.
Disney then released mostly crap for the next decade (other than Enchanted, another favorite of mine), but I enjoyed the Frog and absolutely love Tangled to pieces, and Frozen (while it has its many detractors especially on this board for some reason) I thought was incredibly well done and a return to form for Disney movie musicals (although I'll never be okay that it wasn't Alan Menken that wrote the score). A live-action musical version of Mulan may be good, but I doubt it's necessary.
"Contentment, it seems, simply happens. It appears accompanied by no bravos and no tears."