Mulan is my personal favorite, even more so now that I've realized that Mulan herself is voiced by Ming Na-Wen of Agents of S.H.I.E.L.D. (How did I never know that?)
I'm partial to Pocahontas - I have no clue why, though. I think it's just for "Colors of the Wind" which is absolutely my favorite song from an animated Disney movie.
101 Dalmatians is one movie that I treasure - it was one of my favorite movies as a kid, and it still is one of my favorites now. Cruella is possibly the greatest Disney villain ever, though Scar is also pretty awesome.
I really like The Lion King, Beauty & The Beast (though I haven't watched it in forever), and I enjoy Aladdin. The Little Mermaid is okay. Never liked Tarzan or Hercules.
I adore The Emperor's New Groove. That movie is fantastic.
Atlantis is one that I enjoyed a while ago, but hate now.
As for the newer ones, I liked Frozen more than I expected to, and I think Moana was pretty good. I really don't care for Tangled, though.