What should matter is how it performs. WP is optimized to work with the minimal hardware specs MSFT has called-for and is remarkably snappy with it's single-core processers
Skype effectively can't work on WP7.x. It is an almost useless app as a function of the limitations that Microsoft has imposed because of the hardware that they chose.
In fact that is true throughout the platform -- the sort of powerful, feature rich apps on other platforms simply don't exist on WP because they are strangled by the limitations of the platform.
As a better-than-featurephone email device WP7.x is excellent. And yes, if you focus on flipping between home screen sections the performance is excellent, as it was on WebOS devices. That isn't what people generally use their device for, however.