Having just seen the second season finale last night---I have to say, I still enjoy this show as much as I have from the very start.
This show has strong writing, excellent casting (despite Jared Padalecki, who really gets on my nerves a lot on this show), great acting and dialogue...and I love the look of the show (and the fact that it is shot over in Vancouver...and you can occasionally see Vancouver street signs in what are supposed to be mid-western American cities).
The show is witty, serious, fun, and has a lot of suspense that is carried out really well. This show also has some great music in every episode. I love this show, which started off with a strong first season, and did not disappoint when it came back for the second season.
I am definitely looking forward to the promised third season, and cannot wait to see what happens next.