I tend to think of him a little like the blue guy from guardians of the galaxy. Maybe a tad too literal.
I watched Guardians the other night and I have been thinking the exact thing about CF since then. BTW that character on a second viewing is pretty funny with his literal take on everything.
Rocket Raccoon: [about Drax] His people are completely literal. Metaphors go over his head.
Drax the Destroyer: *Nothing* goes over my head...! My reflexes are too fast, I would catch it.