Having issues with, say, your gull-wing doors is not specific to electric cars. Same with the issues they're having with the Model 3 and suppliers not being able to meet the dates they want. (Drive units dying is specific to electric cars, but that's also likely to just be teething pains.) There's a lot more to a car these days than a power plant.
The engine is, comparatively speaking, the solved problem for car reliability these days, at least in the first 100k or 200k miles. One of the most common characteristics of unreliable or fancy traditional cars is flaky electronic systems, as Telsa is as complicated as anyone there.
I suspect their challenge will be more about getting enough resources for batteries and finishing the production plant.
Remember, right after apple launched the iphone and experts claimed smartphones were for the first world while growth would be in the third world?