I use FSD 99% of the time now and it works 99% of the time I use it. When it doesn't work, it is always in an annoying, going-way-to-slow way. I've never experienced it crash into anything. I'm sure the experts here know better than me, I'm just a lowly customer, but from MY experience, it basically works all the time.
Obviously no crashes ever isn't expected. Even roller coasters have accidents sometimes.
Tesla will get there I'm sure. But I know at least two people that are in Musks influence sphere that believe it to already be the case.