If that does not prove that Apple has been very hasty with this update overall, I don't know what does. The bar for quality control has been set kinda low.
Yes I did, and its comments, prior commenting here. I'm aware that some users managed to upgrade successfully but still that does not change what I believe about this rollout.
Something that's not a rare issue affecting some handfuls of users of just a particular model?
Some of the classic releases that are esteemed as "Apple's most well managed and stable", like Snow Leopard, had worse issues than this.