The UI doesn't follow a conventional way how people use UI in any form of mobile devices.With this logic taken to the extreme, we'd all still be using phones with a typical Nokia-interface. I'm very glad we don't.
What Windows Mobile 7 is doing is a fundamentally different way of how you use a mobile device. You could argue that when IOS was first introduced it was also a different way of how people uses mobile phones. But it was different in the sense that it was not confusing, it was very intuitive.
Just noting I read this part and that I agree.
In contrast Widows7 mobile UI is a confusing mess and very bland to be honest. There no "Wow" factor.
Having used a Windows 7 phone I have to disagree. It's very simple to use. It may lack a "Wow" factor but it is sufficiently different to be interesting.
IOS with its new update introduced folder with the goal of giving you more screen real-state so that if you have a lot of apps you don't have to keep sliding and MSFT adds huge block of tiles
The Windows Phone 7 idea is that you shouldn't need as many "apps", but that apps should plug in to "hubs". I like this idea, but getting back to the actual implementation my personal complaint about this is that too few of the hubs on the phone are extensible by applications.