I don't rely on OS - not without a game plan, redundant backups.
I have no trouble with 8, nothing that is worse than what I "relied" on before.
The one place where people might need to be concerned is in their lack of choice for security programs. I imagine Symantec has some kind of Beta, but Kaspersky won't and on my last install even MSSE would not install so now I use the built in MS Windows Defender along with SuperAntiiSpyware and MalwareBytes.
Sleep, hibernate work better and those are reliable.
If there is an issue, then maybe it is with something I don't use.
Even Apple drivers installed just fine (3.0 thru 3.3)
I did have to upgrade one program (would have anyway).
Funny about how they tweaked and improved IE10 like they did.
I use to have trouble with IE8 and 9. Not this.
And things that brought those to their knees.
So something was done under the hood to make the kernel better... more reliable. Not less.