Scott Barnes, formerly Microsoft Rich Platform Product Manager (WPF & Silverlight), has voiced his opinions on the Windows Phone 7 user interface (UI). "the UI is trying a little to hard to do the opposite of the iPhone, like it’s a challenge they need to rise up against. Examples like no Icons, panning up/down instead of left / right for content etc seems to pack a little too much anti-iPhone." Barnes also feels the Windows Phone 7 launch is similar to Vista. "This is the Windows Vista launch, as after some code resets and downward pressure from above this is almost exactly the same internal conditions Windows Vista team had before their launch, 'get it to market, get it fast and we’ll come back around for the bits we wanted to put in place'."
More info: Windows Mobile 7 the "meh" release