Just to play devil's advocate, he has somewhat of a point. Tesla has only a few years to up their game to the point where the "car" is on par with the best that comes from the other manufacturers. Right now they sell based on the fact that there is nothing out there with a power train that is remotely equal. The car itself (most specifically the interior) is good, but not excellent. They've had to make a lot of compromises because of their low production volumes.
That said, I believe that Tesla CAN catch up. Remember that almost none of an auto interior is actually produced by the automakers themselves anymore. And Tesla is starting to produce volumes that will interest the better quality parts makers. I am 100% certain that, as we speak, the Model S V2.0 interior is in development. And I'm sure that you will have more visible differentiation between trim levels.
In the worst case, if Tesla starts to suffer and their stock slides, one of the bigger makers will acquire them and the brand & technology will live on - as the Daimler Tesla or something similar.