A friend of mine just got one, ex-Chrome core dev so a fairly sharp guy, his one month review was that it was incredibly capable but had already done two maneuvers that would've led to an accident without intervention.
The feedback I heard was definitely not that. The mistakes it makes are incredibly hard to predict, and they were lucky that no one was on the side of the road as they could've killed someone if a person had been there and they'd been a half second late.
That's the point. It's actually worse than a dumber system, because it's not even past the margin where it can go a month without a mistake, but you don't have to correct most days. The absolute worst possible scenario for safety.