For realsies, it doesn't seem to be awful. Ok, no, can't say that with a straight face.
It does look all kinds of awful, but they got Jim Carrey to play Robotnik, and he's doing his silly faces. Dude's seriously good at those. Movies have basically been carried entirely on the merits of his plasticine visage before.
Anyway, now opening the floor for you to heap on the praise and/or vitriol. Go!