There are way more than ten reasons that I love Supernatural, but I figured I would start small.
1.) The Family
There is such a great family dynamic involved with the show. There's Sam and Dean with their brotherhood. There's John the crappy father. Mary the mother who never got the chance to fully prove herself. Sam and Dean would do anything for each other and have multiple times. They've gone to hell and back, literally, for each other.
2.) Bobby Singer
The father the boys should have had. He adopted them in all sense of the word. He was more of a father to them than anyone ever thought of being. Plus, he's the most adorable old drunk with some of the best quotes on the entire show. "Idjits" and "Balls" included.
3.) The Soundtrack
Classic rock for days! The soundtrack is absolutely amazing. I can't hear "Carry on my Wayward Son" without getting emotional. I can't hear "Heat of the Moment" without giggling. It's a toe tapping track and it's absolutely one of my favorite things about the show.
4.) Crowley
The King of Hell. He's a sassy British demon and he's probably one of my favorite characters. He comes up with the best nicknames and despite everything, he deserves to be loved.
5.) Castiel
The fallen angel. The one who raised Dean from perdition. He's a "baby in a trenchcoat", but he's one of my favorite reasons to watch the show.
6.) Baby
The '67 Chevy Impala that has stolen my heart. Baby was passed on to John and it was probably the only good thing he ever did besides sell his soul for Dean to live. Baby is a building block of the show. It's not really Supernatural if Baby isn't in it.
7.) Jo and Ellen's sacrifice
They died so that Sam and Dean could live. Not only that, but so that they could have a fighting chance at surviving and fighting evil.
8.) Jared and Jensen
Jared and Jensen have a bromance of epic proportion. Not only that but Jared struggles with depression. He launched his "Always Keep Fighting" campaign to help people struggling through the same things. Jared and Jensen actually care about their fans. They've consoled plenty of crying fans at conventions because they became overwhelmed.
9.) Misha Collins
He's a giant dork and he owns it. He does so much charity work, mainly "Random Acts of Kindness". He isn't worried about being seen as normal and I love that about him.
10.) It isn't just a show
Despite everything in this article, it isn't just a show to me. I was perfectly normal till an adorable SOB busted into a house late at night and said "Dad's on a hunting trip and he hasn't been home in a few days." This show... It isn't just a show. It's a way of life. It's a means for the fandom to come together because we're all in The Family Business.