It's the Cal Arts/Disneyfication of how he draws. Usually at least with Disney you had a great voice actor attached to solidify a vision of the villain, but as it is this style lacks distinctive edges and points. Every corner has been sanded down or rounded of and it leads to a very "precise" style, but unfortunately not one with pizazz. Such wide, large eyes on what is obviously a villainous character(fuck, his name is BELPHEGOR) is off-putting. It's not an ironclad rule but it's generally accepted that in order to make someone look more villainous or negative they need smaller, distrustful eyes. Granted, there are likely two reasons for the lack of edges and sharpness to designs in Disney's case. On the one, they don't want anything to be too scary so a rounder, softer look is more homogenized and better, and two, even more important: merchandising. Too many sharp sides or corners on designs mean that hard plastic toys are weapons and capable of hurting stupid children playing with them. To avoid that problem altogether, rounded designs are key. However, DC does not have merch like that nor does it try to appeal to a younger audience; in fact, its arrogance and smug-on-its-own-farts aura make it seem obviously aimed intellectually higher. Hence why the dumbing down of the art feels wrong. It's a story that seems to want to be for adults being told by someone of the maturity of a teenager drawn as if it was for children. Of course it'd be jarring. Of course I'm probably just full of shit, this is just my observation. I don't like the looks of him either.