Supernatural is ... sort of a fantasy take on Doctor Who with even more magical elements than Buffy and a big dose of Twilight Zone surrealism thrown in. Earlier seasons had really tight writing (I don't know about recent seasons since I haven't seen them yet) and excellent storytelling.
Give a random episode a chance. People's tastes are so different - you might fall in love with it, you might hate it.
Supernatural, seasons one through five, definitely. The writing and plot were impeccable. I don't recommend anything after that, though. They turned the show backwards and upside-down in Season six, and it was so incomprehensible it wasn't funny. (The original storyline ended with season 5...)
Yes. I happen to like all three series. I would also suggest Due South. It's a Canadian buddy cop show that also has a lot of magical realism. It can be very playful and surreal (like Dr Who) but also does emotional episodes very well.