No, in its current incarnation you have no choice as the default is the Metro interface, I don't want to have to continually switch to a desktop interface, I want the option not to ever see the metro interface as an OS option not having to hack it or install another utility to do that. I really can't understand the MS Intransigence on this.
Whilst it is this way I would never purchase win8 for a desktop system and I feel that is likely to be the same for many who primarily use a desktop system.
I wouldn't have a problem with win8 on a tablet touch screen interface (or even MS Surface, which I quite like). But if I'm going to use a touch screen tablet, why would I pay for win8 when I can get android for free. So by going down this one size fits all it makes users consider other options and not just MS.