I'm looking forward to it, even as a desktop OS
In spite of the headline feature of the touch optimised metro UI, the guts of the OS has not been neglected and Win 8 looks to me to be a better desktop OS than Win 7. There have been many useful enhancements unrelated to the metro UI that will surely benefit the desktop user, such as better backup and restore, file versions, better file transfer, improved explorer, faster boot, secure boot, windows to go, native usb 3, native ISO support.
Much better trackpads and trackpad gesture support is also going to be a corollary of Win 8, with trackpad gestures being an alternative way of navigating the metro UI.
I do admit, I would appreciate the option to switch off the new metro start screen and boot straight into desktop mode instead. But I don't blame Microsoft for not giving this option as they have to encourage people to use and hence buy metro apps from the windows store.
I'll be giving the metro start screen a try for a few weeks. If I can't get on with it, no big deal. A quick google search reveals there are a number of 3rd party tweaks already available to disable the metro start screen and get back the legacy start menu (yet still retain the ability to run metro style apps), including one from a well established developer of windows interface customization software:
http://www.stardock.com/products/start8/