I've looked through MSDN on both the Store API and the Launchers collection, and can't seem to find a task or launcher that would open up an application in the Marketplace application ready for a user to rate, as we could really easily do in Windows Phone 7. Is there an alternative way that I can easily point a user towards leaving a review/rating, or are we going to have to wait until MS provides this, or does it already exist?
I believe, or should I say "I hope", that the "rate and review" command appears automatically under the settings charm for all applications downloaded from the store.
Can anyone confirm this?
Yes it looks like you are right, in the Guidelines for app settings (Windows Store apps) http://msdn.microsoft.com/en-us/library/windows/apps/Hh770544.aspx#user_experience , says that in the charm setting under Rate & Review, the user can rate and review your application.
However: "Only apps that are installed through the Windows Store have the Rate and review entry point."
来源：https://stackoverflow.com/questions/10578342/is-there-an-equivalent-of-wp7s-marketplacereviewtask-for-windows-8-winrt-me