Not as flawless as cannibal though right? The best things she has done with her career are
Making Cannibal >> Refrigerating >> Warrior> Drinking Piss > Animal
Cannibal's singles were better than Warrior's, but as a whole I think Warrior is the better album.
If you look at a lot of Kpop groups, there is always (maybe not always, but usually in big companies) a member or two that are in charge of being the "visual." In Yoona's case, she possesses a lot of the traits of the Korean "Ideal Woman." Yoona, if you hear of the members' first impression of her, was someone that everyone was shocked at, because she had such angelic features.