Although a WWII era Namor might be intriguing, I think it would be too bizarre to work in a TV series. I'd go for a Sub-Mariner series mainly for the sake of Atlantis. seeing some guy running around the surface world in his swim trunks doesn't strike me as particularly interesting. Maybe if he's got a smokin hot bod? That would be mandatory n any case.
And if the masses can't handle a Ditko style Doctor Strange, put the show on HBO. The masses can stick with their CBS procedurals.