Sorry, have to disagree about Metro. Are you talking from experience with using WP7? Almost every review has only good things to say about Metro. When even Gruber(who jumps on every opportunity to diss non-Apple platforms) praises it, you know it's good.
And what about it being uni-coloured? Much of Metro is extremely colorful, including the tiles.
Yeah, dunno. I've seen the reviews and so on, but having played with metro on some devices, admittedly just in a store for maybe 10 minutes a few times, I just don't like it. The large text that just kind of runs off the side of the screen, and content hanging off just at the right edge to scroll to feels sloppy somehow. Also, I find the up transition jarring (kind of a page flip thing). The live tiles are sort of neat, but overall I don't care for the design aesthetic.
This is totally subjective, and probably just inertia w.r.t. what I'm already used to, but I just don't care for it, no matter how well reviewed it is.
And what about it being uni-coloured? Much of Metro is extremely colorful, including the tiles.
Eg. http://ribot.co.uk/wp-content/uploads/2010/10/Panorama_sampl...
http://www.wp7connect.com/wp-content/uploads/2011/03/Woodgro...
http://techblog.ginktage.com/wp-content/uploads/2011/07/1.jp...
http://1.bp.blogspot.com/-lrTGyYjLlrU/TnNaJaTzqHI/AAAAAAAAAC...
Maybe you need to use the phone to appreciate it? Or at least link to an analysis or review stating that Metro UI is bad.