This has actually been a well known criticism of WP7 that goes under the name "low information density". People counter that by saying it's a feature, not a bug.

For me, it creates a problem because every time I pick up a WP7 handset it feels like a feature phone. The nicest feature-phone I ever held, but it still has this limited, focused, prebaked feel that I find hard to explain but which exactly reminds me of the same feeling I get with feature phones. I think the smart phone market is very much an aspirational one where people expect to feel like they're stepping into the future, and WP7 just doesn't feel like that. As much as everyone praises iOS for it's polished and slick nature, that's not actually why people are buying phones (and also why Android succeeds in spite of having missed the polish). They are trying to empower themselves with something more advanced than their previous phone which probably already had things like a facebook widget and weather app, etc.