In the Avengers, Captain America 2 and agents of shield show Cobie Smulders plays Maria hill as a charming, beautiful, competent shield agent, and this is exactly why she's wrong for the part.
In the comics Maria hill is an obnoxious, only vaguely attractive ***** who runs shield into the ground, I hated her with a burning passion so believe me when I say Smulders is WRONG for this role.
I know most people only care when a character they like is made unlikable but it is equally wrong to make an unlikable character lovable.
I like Smulders, but she can't play a total ***** and that's what Maria Hill is.
I know this will never happen but I'd want her replaced with a significantly more annoying actress, someone who I can hate.