SCIFI tried to change Sliders around a bit and tried to give it a long term villain. I don't think it really worked with a show like this. Maybe a villain(ess) that spanned a season at most maybe but a long term one like they tried to put in just plain friggin sucked.
Fox has a history of screwing up good (and by that I mean entertaining) shows and then replacing them with mediocre crap. Family Guy, Futurama, Married With Children, Firefly, the list goes on. I think I read somewhere that MWC was basically given the "shuffle of death" because some new executive producers wife hated the show and replaced it with something else in it's time slot. Didn't really do any advertising in it's new slot and thus lost viewers, thereby cancelling the show. Hrm...where have we heard that one before.
Now, MWC is an utterly useless show with no redeeming values whatsoever except for the fact that it's funny. I mean, who doesn't watch MWC and think not laugh at the dysfunctional Bundys. Helps you unwind and think, boy, I'm glad I don't have it that bad.
I think one thing the networks in the US need to realize is that, sometimes it's better to have a show that spans one season only. Maybe some that last a few seasons. Sometimes shows just need to die. The shows wear out what made them worth watching. Hell, I haven't really watched the Simpsons in the last 8-10 years. Only catching the odd episode here and there. It's just not the same show anymore. I understand shows need to evolve to retain watchers and sometimes it's change for the better but sometimes it just prolongs the death.