It's just that some idiot manager came up with the "unified experience" idea and shoved that shit onto desktop Windows without any time for polish.
Ironically I think pretty much anyone's first experience with metro was Windows 8 on PC, which was such a disaster that people wouldn't even give Windows phone a try because it had the same UI that they learned to hate. Not to say this is the reason Windows Phone failed, but probably one of the many factors.
has there been research done on whether these difficulties occur in all age groups? Because I can easily see this being an artifact of tradition.
People who don't use a lot of analog devices may be confused by a skeuomorphic interface, and may appreciate the simplicity of a flat design.
Here's what tobiasandtobias had to say about that in their blog:
Even 'digital natives' live in the physical world. We start learning how it works before we ever touch a computer, and even the most dedicated nerd spends more time interacting with physical objects than with digital interfaces. It doesn't take additional learning to know that an object casting a shadow on another is in front of that other, for example. Failing to leverage that existing knowledge is tantamount to shutting down whole swathes of users' brains.
(The blog is no longer online unfortunately.)
> "nah.. that looks terrible and we aren't going to be cohesive, so lets do our own thing over here."
I wish this were the case. Instead all Microsoft products have switched to the ugly Flat UI, including Word, PowerPoint, Excel, etc.