What distros have you tried and thought, "Nope, this one's not for me"?

It's funny, I was really excited for Ubuntu when it first released, and actually quite enjoyed it. On the other hand, RPM distros seemed like an absolute mess, at that time. Now it's the exact opposite. At least in regards to Fedora, it's a very well thought out and maintained distro if you want things to just work, and Ubuntu makes me uncomfortable.