Little Mermaid 2, Peter Pan 2, Lion King 2 and soon to be 3, Aladdin 2 & 3, The Goofy movie 2, Beauty and the Beast 2 and 3 and the list of cheapening sequels goes on and on and on. I do not blame the animation departmert for these 3rd rate "movies". They are forced upon the animation department by someone who says "make it cheap, make it quick, make it make lots of money before anyone notices its crap".
You can't give the credit to Disney for Toy Story, Bug's Life, Monsters Inc, Nemo because the creativity was bought and paid for by Pixar. Disney just distributes it and makes tons of money off of Pixar's quality.
That's not to say that Disney can't make good animated movies any more. The recient ones have been pretty good (Atlantis, Treasure Planet, Brother Bear) - just nobody went to them. Treasure Planet was constrained by a marketing deal with McDonalds so it was released in November (along with Harry Potter and several other family movies at that time) instead of during the summer when it should have been released.
A prior poster suggested listing the good and bad over the past several years.
Disney's California Adventure, closing the Skyway arial tram, closing the submarine rides (no replacements) and the list of closures goes on. There have been some great additions: Indiana Jones, Mission Space, Tower of Terror, Rockin' Rollercoaster.