Looking at the picture above of various SmartPhone UI’s, its clear that WP7’s one saving grace is that it certainly has a new and innovative UI.
Windows Phone 7 is due to be released November-ish this year, and straight away its going to be an easy target for criticism. No copy/paste, no side-loading apps, no multi-tasking, no storage cards, no new hubs. All the restrictions of the iPhone, and none of the benefits of Windows Mobile 6.5. It will be easy for reviewers to label it as an instant FAIL.
Microsoft has said that intend to fix functionality gaps in later releases, and this may have been good enough for the iPhone initial release – but people’s expectations have risen sharply since then. I hope it will be enough to get it to the next release!