Most here straight up disagree with you.
Model 3 will be every bit as awesome as promised, and will arrive on time - by the end of 2017. Tesla can't afford to be late this time.
Roadster was late because amazingly enough, building cars is hard, even when you have Lotus building most of the car for you. Tesla had transmission problems where the transmissions they got couldn't handle the torque.
MS was late because Tesla had to learn how to build the rest of the car.
MX was late because of hubris, and the FWDs. Building high-tech fancy doors is hard when trying to make them not leak and still meet a 5 star safety spec.
M3 won't be late. Its designed from the ground up for manufacturability, and its not trying anything new technology wise that Tesla hasn't already proven in their existing models. Pencils have been down on the design for several months now, Gigafactory is on or ahead of schedule, Fremont has the stamping capacity and the paint shop capacity already online, so they just need to build a body-in-white line and a final assembly line for it.
We shall see.