Grit. Not in the sense that you’d want to see a generic “dark” take on Thor, but in the sense that you want to feel Thor’s rage when he rages. You want to see him fight like hell, and take as much he dishes out — maybe more. You want to have a visceral reaction to the guy, and what happens to him. You don’t want his adventures to be clean and antiseptic. You want to see the dirt, and grime and blood. You want to feel every bone crunching moment of every fight. And when he unleashes the storm, you want to feel like you’re seeing the power of a GOD at work.
The best example I can give you is the end of Ultimates 2. When Thor shows up and kicks ass, he shows up and kicks ass. He isn’t screwing around. There’s a certain brutal, cock-eyed realism to Thor in that moment (and through that book in general) that I really resonate to and want to expand on.
If they are able to deliver what he just said... it will be the best marvel movie ever.