Pay for WMC
That's a deal breaker, when I can get a laptop now with win7 and free WMC.
There is no technical reason why these have to be fullscreen, or why Windows can't adapt itself when it detects a non-touch device (such as hundreds of millions of pc's). Instead of the awful, unintuitive charms bar and fullscreen apps, we could have had an elegant OS where all kinds of apps are 1st class citizens. This would take care of nearly every complaint about Win 8.
Microsoft should have spent some time fixing the half baked parts in the OS - why for instance is the network settings and file picker Metro and still shown in the desktop? Settings in general are strewn all over the place. Logout and shutdown are in 2 different places and impossible to discover. The volume OSD is on the top upper left for the single reason that that's where WP7 phones have a volume key - how stupid is that ?!!
This is not an OS for traditional pc's. Yes they made it faster, made some minor tweaks to file manager etc. But the primary focus is touch devices and the goal was to make an OS to power tablets, which MS didn't have till now.