The network that Supernatural airs on here really hasn't done the show any favors. It seems like they barely promote it, and they put it in the same time slot against Goliath shows like Lost and Heroes (both of which are totally inferior). I'm totally shocked that it hasn't been canceled yet although it's ratings, when you take into consideration the smallish network it runs on, are pretty decent actually, which is why they're talking about possibly doing a sixth season.

I like the show for much of the same reasons as you stated, it's a show about people, before it's about the various fantasy creatures, which is the same reason I got so utterly hooked by Battlestar Galactica.

Absolutely. And I'll commit even more nerd blasphemy and say that I like Supernatural better because they've maintained the quality of their show far better than BSG did in it's fourth season (which totally imploded). It seems that most shows start out with a bang and by season four start drifting and losing focus. It's kind of amazing how this show gets better and better as it goes on. I really hope that they can maintain the quality of the show this season.