Most Disappointing Sequel?

There are plenty of bad sequels out there. This is relatively common knowledge, so I don't go into sequels with high expectations. But when...

Austin Powers II, Spy Who Shagged me came out, I was very disappointed. I thought they strayed too far from the original brand of humor that made the first one great. I know many will disagree and loved the movie so I won't say it was horrible, but I was disappointed.