It wasn't bad, Warehouse 13 was there and pretty good too, I wouldn't put Bewitched from the 60's in sci-fi, but okay ... Also looking at it one can see various timelines of watching those shows, I know some I have seen more as re-runs on comet tv or something. SyFy gets a bad rap, it is good for low-budget sci-fi though.
As everything, opinion counts for a lot, I'm not surprised Firefly is #1 even if that would not be my vote. A lot of sci-fi exists over-represented in the meme-o-sphere, Firefly is up there, same as the Next Generation, it's great, though I know people today who have recently watched it and wondered why it is so highly rated. For memes, it is hugely popular.