Despite high expectations, the internet is not a place where you can say whatever you want. There are etiquettes to make sure everyone could have reasonably enjoyable online experience. That's why there are moderators and administrators everywhere to have personal assaults in discussion threads removed, and to have user who spam banned.
The same applies to Windows Phone Store, and Windows Store. The app review you submitted don't just appear immediately. Instead, there is someone (or some bot) at Microsoft having a quick look at it first, and have it published if nothing particularly naught is found. You guys should have been used to it already, after so long time.
However, according to Chinese site WPDang, online etiquette does not exist in the Chinese Windows Phone Store, which is causing a growing problem for user experience.