I'm not saying the rest of 8 hasn't seen some improvements overall as far as security, backup and restoration, and other main functions. The gui change is the main obstacle most are attempting to deal with.
Here compatibility issues would make 8 a candidate for second OS only. For anyone using an older MS optical mouse plugged in by way of a PS/2 adapter the lastest two updates 8.0 and 8.2 for the Intellipoint software has a new device detection screen where now you have to plug the mouse into a usb port in order to see the software work.
On 7 it doesn't matter if the older Trackball Explorer optical mouse is plugged in either way since I can simply run with an earlier version of the same. That helps when you are planning to boot with a live disk or flash drive with another OS in use there having the PS/2 adapter.
As far as video, sound not one problem! Getting the Gigabyte board's software to work and install chipset and other drivers
however has been another obstacle I would have the Windows updates would have solved.