SCI FI Wire has an article on 2009-2010 sci-fi/fantasy series:
Supernatural: This series—about two hot guys who drive a hot car and fight demons—has managed to do something shocking: It's taken the worst timeslot on television (Thursdays at 9 p.m.) and grown in the ratings. Not a lot, but enough. And the new lead-in of The Vampire Diaries might just help it do even better, especially considering that the teen girls who watch will probably stay tuned to see two hot guys who drive a hot car and fight demons. Yes, it's still up against CBS' CSI, ABC's Grey's Anatomy and now Fox's Fringe, but we're still calling Supernatural a WINNER.
Source: SCI FI Wire.