Hating the ending of Supernatural is an opinion, understanding it is right.
It might seem like a big fat kick in the balls to any supernatural lover (including myself a bit) that Dean getting impaled on a rusty nail while on a routine vamp hunt would be unethical, and you're right.
Dean being Dean, he's been through a lot, hell, possession, murdering the ones he loves, daddy and mommy issues ect.
and his major motto, the one he lives by: "Going out swinging." probably seemed like foreshadowing to most. Guns blazing, saving the world again, that's how it was expected, and he kinda did, he died on a hunt!
You could go on and on about how terrible the ending was, all of the reasons why, and still have 8 pages left of explanation, but to understand anything as I'm guessing most people know, you have to dig deeper, understand it through a different persons glasses.
There's way more to the picture, the actors said stuff about that, the directors, hell even Kripke himself. They all agree that this was the best possible ending for the Winchesters, and I trust them.
There are some things people have pointed out that in their opinion could be tweaked to perfection, and when you really see all the different opinions and options and theories for the ending, they really are amazing and just so creative that I think any way the show could have ended would have been perfect, whether Kripke and the crew were the ones making the call, or the audience.
Now, I bet with all of this talk, you're expecting a deep dive explanation, and honest to Chuck I was going to, but I want to cut it short because I have something else in mind ;)
