I've lived in many different states from coast to coast (CA, IL, OH, IN, KY, MA, VA, RI), and also in Italy and Germany.
MA is far from the worst driving experience. OK, the potholes suck, I'll grant that. But CA is far worse in terms of rude drivers.
Oddly, while I couldn't pick a *worst* place to drive (they all suck in different ways), I can pick a best place. Germany, overall, is simply excellent.