Well Teslas goal is to accelerate the turn over to electric cars. They don't have to be perfect and become 100 years old. Just making enough trouble to the other car manufactures to switch over to electric cars.
I've payed 4000€ in 2011 for a Model S reservation, and got my Model S in 2013. Late but I got it. And I've payed another 1000€ to reserve a CPO Model X in 2017 and got it a few weeks later. Both cars had their little problems, but all of them had been solved under warranty and they're working fine till today.
Yes Tesla is slower than promised and nearly never had been reaching its goals in expected time range. But they reached it. And even Model 3 will be delivered. Of course later than promised, but I'm sure it will be.
Only time will tell but those who have received there model 3 are already reporting issues:
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Yes, and to be honestly: I expected that. The first Roadster had problems, the Model S had problems and the Model X had problems. So why the Model 3 should be perfect since day one?
Its not good and its even worse for the customers. But its the price you pay, if you sell or buy a product which is still in development and not finally tested yet. And its the truth, the first car from the line is not as good as the 100th car and not as good as the 20,000th. Improvements were maid every week.