I've had zero issues. Then again I worked at NeXT and Apple and have been running variants of OS X back from when it was NeXTSTEP. I know this OS.
The issues have been mainly to do with graphics switching, especially if machine is never rebooted, where the graphics will become very choppy, and then several sleep wake cycles it will be fine again.
Also anything to do with samba can crash the finder, anything to do with authentication to active directory (which uses samba) can freeze the machine.
Not everybody uses the machine in this way, and therefore won’t experience the issues.