And as you yourself mentioned, just because you had good experiences with something doesn't mean others might not have. To use your own words: "It amazes me that people think if they didn't see a problem it doesn't exist." If you look even just through this forum, let alone online in general, you'll see complaints about practically every iOS update, especially the major version bumps (and same will apply to Android, Windows, etc.).
Again, that's not to say it's good or anything like that, but it's to say that it's not new or unusual, it's just a reality of complex software and hardware.
Great experiences doesn't mean bug free. I had my share of bugs in earlier iOS releases also but my point remains that iOS 8 has been the worst experience for me of any previous version. And while I read about all the different issues users had with earlier versions, this time around the complaints are mostly the same or at the very least extremely similar.
I don't want you to take me wrong; I prefer iOS to anything else and I'm sure Apple will fix most of the worst issues but I am concerned that this experience isn't as smooth and trouble free as earlier versions were.