OK, this is coming from someone who didn't start watching the show until last year when I picked up the 1st season on sale. I've watched everything I can get my hands on for it now so here's why should you watch Supernatural...
#1 - the boys are pretty and that's always a good reason #2 - the relationship between the brothers and their father figures is absolutely awesome and very realistic. Sometimes they are absolutely ready to kill one and other, but will jump in and defend each other when attacked from the outside. #3 - Intricate overarcing plotline that builds an entire mythos through little hooks and hints dropped in a variety of episodes #4 - humor. even in the most dire circumstances and angst filled episodes there is a hint of humor that will peak out just when it's starting to get so deep and painful that the humor comes across as a brilliant ray of much needed sunshine. #5 - Supporting characters are so well developed. I'm still missing Missouri, Ash, and Ellen. I adored Bella, Jo had so much potential...they don't skimp on their supporting characters at all. #6 - them villains is EVIL - seriously, I don't think there's been a MoW or season villain yet that didn't totally deserve what they got. Yet at the same time some of the villains are very charismatic in an odd sort of way. #7 - solid writing - for the most part the writing team is top notch and put together really well crafted episodes #8 - the characterizations are consistent. Sam and Dean have quirks and you see these quirks pop up in several different episodes. #9 - continuity is king - something that happened in season 1 or 2 is referred to in seasons 3 & 4, there isn't a sense that prior seasons don't matter #10 - See #1 :)
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#1 - the boys are pretty and that's always a good reason
#2 - the relationship between the brothers and their father figures is absolutely awesome and very realistic. Sometimes they are absolutely ready to kill one and other, but will jump in and defend each other when attacked from the outside.
#3 - Intricate overarcing plotline that builds an entire mythos through little hooks and hints dropped in a variety of episodes
#4 - humor. even in the most dire circumstances and angst filled episodes there is a hint of humor that will peak out just when it's starting to get so deep and painful that the humor comes across as a brilliant ray of much needed sunshine.
#5 - Supporting characters are so well developed. I'm still missing Missouri, Ash, and Ellen. I adored Bella, Jo had so much potential...they don't skimp on their supporting characters at all.
#6 - them villains is EVIL - seriously, I don't think there's been a MoW or season villain yet that didn't totally deserve what they got. Yet at the same time some of the villains are very charismatic in an odd sort of way.
#7 - solid writing - for the most part the writing team is top notch and put together really well crafted episodes
#8 - the characterizations are consistent. Sam and Dean have quirks and you see these quirks pop up in several different episodes.
#9 - continuity is king - something that happened in season 1 or 2 is referred to in seasons 3 & 4, there isn't a sense that prior seasons don't matter
#10 - See #1 :)