These things you're hearing only happen to a fraction of the buyers. That's normal for all consumer electronics. I read that Sony expected an even higher fail percentage.
And some errors can't be noticed or don't appear until it's tested by millions.
I'm gonna wait a couple of months so they have time to fix some of the kinks and improve the software, not saying that it's bad now but they always change some things for better usability, but that PS4 will be mine.