Have you used WP beyond seeing screenshots? That homescreen is that way because they want to show the flexibility of tiles in Windows Phone 8.
Coloring Metro to be ugly based on that is almost like seeing a MySpace page and calling HTML/CSS ugly looking.
If you take the mini tile out of the equation, here's a video showcasing WP 7.5 (WP8 can be made to look like this).
http://www.youtube.com/watch?v=locNEna0of4&feature=plcp
What's ugly about that? People's tastes differ, of course, but a lot of people use it and seem to like it for the most part.
If you're really interested in the design philosophy instead of seeing a screenshot and knocking it down in a knee jerk comment(Well, this is HN with its biases, who am I kidding), here's some analysis of Metro's alternative approach.
http://www.riagenic.com/archives/487
http://www.riagenic.com/archives/493
http://www.riagenic.com/archives/526
>Also, this is DOA in the US if they are AT&T exclusive.
>Regardless, I'm wondering if the average consumer feels the same way as well. WP7 is not selling well, and WP8 (and the new Lumias) don't really differentiate themselves that much from the previous iteration in terms of what a consumer will see in the first few minutes of using the phone.
Even the Lumia 900 with the deprecated WP7 had decent sales and was second on AT&T after the iPhone and then beat the One X till the S3 came into the picture and WP8 was announced.
http://www.wpcentral.com/sites/wpcentral.com/files/postimage...
Edit:
Here's Woz calling it a no contest.
http://www.theverge.com/2012/4/28/2983312/steve-wozniak-wind...
And here's Scott Adams thoughts after trying WP:
http://dilbert.com/blog/entry/windows_phone_challenge_result...
USER INTERFACE
Samsung/Windows: GREAT
iPhone: GOOD
HTC EVO 3D/Android: POOR
>The Windows phone has the best user interface experience, although the onscreen keyboard is problematic just as it is with the other phones I used. The Windows interface is intuitive, simple, and has a liveliness that I find appealing. Voice call quality was good, and battery life seemed good too. I declare it the winner compared to my iPhone 3GS with AT&T and my HTC EVO 3D with Android on the Sprint network.