I think it is probably the people who take the show, and fandom, Very Seriously, would hate it, as generally breaking the fourth wall is not the Done Thing in Serious Entertainment. But COME ON it is a show about brothers who fight demons and look really, really, ridiculously good doing it!

Further proof that SPN fandom has no goddamn sense of humor.

LOL TRUTH. AND I'M NOT EVEN IN THIS FANDOM.