Windows 8, just like every other even numbered operating system version from Microsoft, has issues. It's fine if you don't work your system like I do. Me, I'd kill the OS in less than 2 minutes, just like I did with Vista.
that's something we always do with a new OS, I see how long it takes me to get it to bluescreen so I can test its stability. Under 2 minutes for Vista, and under 3 for 8. Took me a few WEEKS to do that with 7.