Someone else probably already brought this up.... but Madagascar is NOT a Disney movie.
I used to love animated Disney films. Most of the early ones that Walt Disney was directly involved with are great. I also love the animated films that came out between 1988 and 2000 or 2001, during which time the company's animation department experienced something of a rebirth jump started by a lot of new staff and the success of The Little Mermaid.
I feel that the company is not what it used to be. Dinosaur, Home on the Range and Chicken Little were all pretty awful, IMO.
Pixar films, on the other hand, have always been and continue to be some of the best stuff out there. Pixar is not Disney, but they have had a very close relationship with the company for over 10 years now, and Disney distributes all of their films.
The film animation industry in the USA was more or less in ruin at the start of the 90s and most companies had given up on making any money in it, so few tried. Then Beauty & The Beast was nominated for Best Picture, The Lion King made close to 800 million worldwide and Toy Story did over 300 million worldwide and all of a sudden every major movie studio had plans of opening up their own animation departments.
What we ended up seeing after that was, for the most part, a bunch of shitty copycat films. A few exceptions, like Dreamworks' Prince of Egypt and Shrek, managed to be somewhat original and successful in their own right.
Nobody could make as much money doing traditional 2D animation as Disney made with The Lion King, and not even Disney could duplicate that success, but there was more and more demand for CG films like Toy Story so eventually that's all that was getting made.
Most of the non-Pixar ones are still weak derivative crap, IMO, including Madagascar... but I still like the real Pixar movies.
Those include, to date, Toy Story, A Bug's Life, Toy Story II, Monster's Inc, Finding Nemo, The Incredibles, Cars, and Ratatouille.
I was worried that they may have jumped the shark with Cars, which for my money was their worst offering ever (but still one of the best films of the year)... but Ratatouille was back up to their normal standards I think.
As for Disney live action films... The Sixth Sense and Pulp Fiction were both okay. Most of the ones that they actually release under the Disney label are family-oriented pablum not worth watching.