Tesla has made large gains in their production compared to other manufacturers in the same class of cars[0]. However, from what I've heard the interior build quality on Teslas is that it is of the lowest quality in their price bracket. As such, while the numbers are promising they are at a bit of a discontinuity point in their market that might show these numbers to be more favorable than they actually are.

[0] https://cleantechnica.com/2016/01/15/1-large-luxury-car-in-u...