Honestly I don't really see how it is hard to use on a desktop/laptop? Sure it is different and a little bit odd at first but basically all they have changed is the start menu, something which I hardly ever use these days. The 80% of applications I use are pinned to the taskbar, the other 20% I did have pinned to the start menu but on Windows 8 I just have them "pinned" on the start screen. Not hugely different.
The whole Metro thing I have kept away from as I have no real need for "full screen apps". It is a little annoying that it is pushed into your face now and then but with the RTM it is possible to load to the desktop rather than the start screen which, while only a small change, is very helpful at making the upgrade to Windows 8 less jarring than it was in the previews we had before.