Yes, it is better than metro, but there is a stark difference between computer usage and mobile phone usage. Mobile phones are used for calling/texting etc, desktops are used for various things like programming, mobiles are used round the clock, desktops normally aren't used round the clock, so it makes sense of having colourful windows for a mobile phone but for me it doesn't make sense to have a colourful window theme for a desktop OS.
I don't think they meant to show a laptop/desktop there.
That is my point actually a chromebook is used casually like a phone, so it makes sense to have colourful things in it to say entice users with beautiful OS, I wouldn't want colourful windows on my linux box where I code :D.
I have tried almost all linux distro, and currently I am on elementary OS, I am bored of almost every other DE, Pantheon seems to be delightful to use!
http://cdn03.androidauthority.net/wp-content/uploads/2014/07...
http://cdn.makeuseof.com/wp-content/uploads/2014/07/material...
I think it works fine. Certainly better than Metro ever did.