Yes and no. They've got a better head than the networks usually have for sci-fi, but it also seems to have resulted in sci-fi being gone from the primary networks where it can be encountered by the mainstream. I think this self-cloistering might wind up bad for sci-fi in the long run.
Let's face it.
By network standards all Sci-fi shows have been sorta ratings challenged. On cable the ratings expectations are lower and offset by the fact that you have a smart, educated audience with a high income.