[stcredzero]

This point is useless, the entire number 4 in your post.

I have read that there are issues with proper implementation and understanding of UI conventions with WP7. Certainly, this is true for the iPhone as well: not all iPhone apps are consistent or slick, and the UI conventions have some key differences from desktop apps. It will be even more critical for WP7, since they have a markedly different set of UI conventions.

Given that the developer pool for WP7 is much smaller at this point, a few highly visible but poorly implemented apps are going to have a disproportionate effect. That would be a pity, as Metro really is a setup up in UX design from iPhone.