Futurama is such a weird thing to me. I loved the original run of the series and when it was canned first, it stank, but I moved on. When it came back--twice--I did find that the stories and tone of the series changed and it wasn't exactly my thing. It did get a nice wrap up and I thought that was at least a better ending than those kind of terrible "movies" made in the interim when Futurama was originally cancelled.
This show is the only example I know of that no one watched when it's originally running, and only gets popular when it's cancelled and gone.