Worthless? They fought and carved their own state in a new and completely different region from their indigenous lands. They, as a group, weren't even supposed to exist now, since France was just importing slaves, working them to death, and then replacing them with more, to follow the same process. The only reason they still exist is because of their revolution. Plus, even after paying France they were still able to stabilize themselves.
Some of you are so shortsighted. You only see things based on now, and that's why you are easy to impress and manipulate.