This really happens with a lot of characters. People see the "gimmick" and don't read the supports, so they think the character is just the gimmick. An example from 3H is Sylvain. If you don't get any of his supports past C level, you'd think he's just a fuckboy. But he has his reasons and they're surprisingly deep, which are covered in his higher supports.
Or, people just don't like certain character types and even if they do read the supports, they don't care and will still complain. If you don't like the skirt chaser characters you ignore Sylvain's other, good traits. If you don't like young smart mages, you only look at Ricken's "I'm not a child" stuff and nothing else.