I am gonna kill disney.
The FOX AND THE HOUND 2 (NONONONONO)
Little Mermaid two
Cinderella 2+3 (wtf?)
and pretty much any other sequel, cept toy story and Alladin. You just cant go wrong with robin williams geniism.
Now that I think about it Dr. Dolittle 2 & 3 are horrible sequels...But the original Dr. Dolittle (The remake starring Eddie Murphy.) was mediocre to begin with.