Ugly and non-mature?
I seriously wonder what people have against a timeless, stylized look. It's one of the reasons that WoW still looks great today in spite of its very low polygon count.
Stylized art styles add characterization and personality to the game over a more "realistic" approach, while keeping the game a healthy distance away from the
Uncanny Valley. It also ages VERY well, because the art is more about the style than it is about the polygon count; as the polygon count drifts away from the "current" technological peak of each successive year, the style never changes. ESO, on the other hand, I can almost guarantee that it is going to look pretty bad in a couple of years from now.
Ugly is purely subjective, so I'll give you that.
Non-mature, however... I for one think it is very mature to give your game a "face" that ages well. Good business move!