I think the definition of great car is highly subjective, so let us move that out of the discussion.
Car manufacturers (all over the world including the Germans) now try and compare their cars especially EVs against Tesla and that make it as the gold standard or the benchmark against which other EVs are compared. The supercharger network is an integral part of the Tesla buying decision rather than just an icing on the cake. Most of the Tesla holders rarely use supercharger for regular commute unless we are doing long drives but still it forms the integral part of the decision as we spend more than £40,000 on our Teslas. Any car if we spend that much of money including the i3 which comes close to £35000 we will be looking at charging solutions even if we charge at home most of the time. That makes buying Tesla from good to great independent of ‘the car’
I am not sure other manufacturers still understand EV they are still keeping their umbilical cord of ICE cars intact when they try to move away from fossil fuels. It is not just about the car when it comes to EV. It is the whole model that needs to be changed that includes the car (a small fraction of the bigger picture), charging network, automation, business model of selling EVs, tariffs related to electricity etc.,I think Tesla has a much better understanding of these issues than the traditional car manufacturers. The one mistake traditional car makers keep doing again and again is not making any effort to restructure their dealership networks, that clearly points towards their lack of understanding of EV tech.
There are many other industries/MNCs that made the same mistake when a new tech or disruptive business model suddenly came up. Thomas cook, Nokia, Windows, Ferrari, Manchester United, so many to mention. Hopefully the german companies severe the ties with their dealerships and focus on selling cars direct to consumers.