Seeing the commercials just drove me away. I didn't like how the presented it at all, and it looked like a bad show placed in space to attract nerds. I personally like Babylon 5 and the stargate movies/shows. Startrek ranges from good to horrible in order of original to newer. Sanctuary is a very good Scifi show, though not of the space breed. Also: Macgyver. (I know he doesn't fit the list, but he is awesome enough to break boundaries)
Edit: Startrek goodness was backwards. Also, I've never seen firefly, though I've heard many good things about it.
Also, I completely forgot about the twilight zone, great show.