I think the lower ratings are because of Bela. She was in the previews, so people tuned out. I think people hate the character that much.

You already know I absolutely agree with you. I won't watch any episode she's in, or Ruby.

Look at how she ruined what could've been two fantastic episodes - Fresh Blood and now Dream. People are tired of wading through her crap to get to the good Sam and Dean stuff and the ratings are really starting to reflect that, IMO.