I love the metro interface. It is just so simple and smart. I would also love to use Windows 8 with a touchscreen to enable all the touch features.
Also, I think of it this way... As some person said on this thread, it is not actually Windows 8, cause you cant get out of metro. And it is a really big issue. But I mean, it is like installing Linux on your TF. You would just install it, check it out for a little while, and then switch back for android. I wouldn't actually use Linux on the Transformer. On Linux you wouldn't actually use Word or Excel on your TF. And if you had windows, same thing... you probably wouldn't use Photoshop or After Effects because you just don't need to. If you are on a mobile device, obviously the OS has to be limited only on the features that are useful on a mobile device. Photoshop would burn your TF most probably, so I don't really see the use of using the classic Windows desktop with a Transformer.
P.S. The Metro UI freaking ROCKS!