Metro isn't even supposed to be used on a workstation. It is as simple as that. Of course "windows 7" is better for real work on a desktop, noone will ever claim otherwise (for other than marketing purposes or for bashing windows 8).
So I don't know what your beef is, just don't use Metro for stuff it isn't good for.
And use it for what it is good for, on your laptop in "tablet-mode" for instance. Don't use it on your workstation, that's just insane.