I don't think anyone is saying it's that much different. To me, that's what makes it suspicious. Sense, MotoBlur, & TouchWiz all fragment the android platform, break/change certain view widgets, and lag behind the major release. If you've ever written an android application, you probably remember how you have to remember to set the fonts, colors, font sizes, and just about every property of every widget just to make sure your app looks consistent. WP7 being brand new has the same advantage that iOS does. You don't have to guess what you're UI will look like on someone's phone because they all have the same environment. On Android, it's absurd.

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I'll take this a step further and say that this is at least one of the reasons that there aren't as many high quality apps in the Android Market. Though, there are obviously several more.