Places like Touch Arcade and other curations also highlight lots of great games. There needs to be the ability to make curated lists like a mall within the app stores just like Steam or the actual internet.
The markets and stores should always be open to developer submissions, they should always have top lists of different types and categories, but they also need curated lists of games that you can browse and find within the store. This alone would put more quality games in the top lists that actually have gameplay and are worth it.