I thought it was okay. In all honesty, I feel like they should have ended the show so much sooner.
The fact that Sam and Dean die so many times in the show, and are brought back, it just didn't feel as unique of an ending. I mean, we kind of expected it to end that way. With the guys finally going to heaven. I cringed at the makeup for Sam when he was older, that didn't look good. Felt rushed to me.
For a show that aired for 15 years, it kind of gets repetitive after a while. That's why I wish shows would last for only 5-7 seasons. Having a ton more can become too much. And with Supernatural, it felt like they could have ended it seasons ago.