I'd say a 9. I realize that it won't have all of the features iOS does, but honestly I don't care. I'm really bored with iOS and I want something new. I was really tempted by android, but I hate their way of business. "This may not work with this", "you may not be able to upgrade to that". It's dumb. I mean they just now got netflix, and even that isn't going well because it's only on select phones. As far as Windows Phone goes, I became interested when I decided to watch the Mango conference because I had to write an article about it. As soon as I saw how tight they plan to integrate the phone into the apps, and vice versa, I was sold. Android kind of does app integration, but not in the way that MS plans to.
The only real good thing about iOS is the apps. Other then that, I don't really find that much keeping me on the iPhone. It seems like Apple hasn't done much innovation since they changed the smartphone market with the original iphone. Also, I don't like how apple makes me wait for features that other platforms already have. My biggest iOS annoyance is the notification system, or the lack of one. For a company that likes to mock Microsoft, it's a little confusing as to why they use dialog boxes to alert me I have a notification. It reminds me a lot of the yellow triangle with the exclamation through it from the windows 95 dialog boxes.
So here I am, looking to buy my first windows phone. I was really hoping it wouldn't cost me more then $400, because even that is a lot for a phone. Maybe I will just get a focus from ebay, and use my upgrade on a windows phone 7 that ships with mango. My upgrade is in october, so that kind of lines up nicely...