really, why all the hate for metro? Are people so backwards that they really used the start menu for anything other than shutting down and control panel (both of which are easy to access using the Charms menu)? All of the metro programs are 'extras' which are not really required, and while different it does not hurt the usability of Windows as a whole, and adds some potential capability (though I am not entirely sold on that point yet, but we will see what developers come up with).
I am sure there will be plenty of ways to get around Secure Boot shortly after it is released. Granted it will void warranty, but I am pretty sure that duel booting, or loading any OS other than what came with your machine in the first place, would void the warranty in the first place.