It's just distinct and noticably different. Why that bothers you so intensely is something I don't know nor is it something I'd ever understand as I'm not you. I can't get behind that.
I THINK what bothers him is not Robin's character but you people's need to show him her magnificent character* in the crew. Get off it, and if he wants to have the viewpoint, that the character is crap, let him do it. Why is it bothering you so much that you need to justify robin's character for him.
I edited that word.