Perhaps, but it's not like there's a lot of other examples of battery EVs out there to compare with, just the Leaf and the Bolt really. There's also the motors in the Volt and Prius (which are both capable of running motor-only, and for the Volt the motor provides all the propulsion). But you have a point, none of those others have had any motor problems I've heard of. Thought to be fair, the Tesla motors are a lot more powerful than those in any of those other cars.