I feel ya. I'm really nervous about the quality of this car. I'm ready, willing, and able to say "no" to a crappy build, if that's what they present me with.
That being said, based on what I've heard, I've got nothing to worry about. Sure, there are people that are very vocal about the issues they're dealing with; but, there are a lot of people that have posted once after delivery, raving about the car too. I have to imagine that a lot of folks actually did get really good builds.
Plus: I've been really carefully scrutinizing my current Acura, based on what I've heard about Tesla build quality, and I've noticed issues that I never picked up on before - in a supposedly reliable, well-built car!