Amazing finale. They brought the show full circle perfectly and the flashbacks this episode were the best since season 2. Awesome to see Deathstroke back and everyone involved. Though, I find it strange that Oliver would resort to using Deathstroke's and Captain Boomerang of all people's help, before Roy. He would have made the whole thing more complete. But damn, Prometheus is by far the best villain this show has had.
I'm also totally calling it.