It is definitely my favourite show in the world. Ever since the first episode I was so hooked. However, I have stopped watching the newest season at least for now because it just doesn't feel the same feeling I had before. I'll finish it up when I get the time.
I'd say my favourite season or episodes was when Castiel first came into the picture and they worked side by side.
Jared and Jenson are defiantly like my idols when it comes to horror movies, made me want to be apart of one someday. I'd say that it's because of them it makes the show entertaining to watch, and makes you think that they are really brothers. They work amazingly well with eachother.