I can't quite put my finger on it but there are some notable differences between the visual preferences among the different gens. I think Hara at her prime could've been a top visual had she started her career in the 4th gen despite being heavily overshadowed by the more cute, "pure" looking visuals from 2nd gen (e.g. Yoona, Suzy, Seolhyun).
I also think she has that egirl, simp twitchwhore look that's more of a recent phenomena. Her hair and demeanor remind me of Karina in some ways.