In a bid to polish the image of its App Store, Apple is adding a star ratings system. But a better move, writes Appboy.com's Cezary Pietrzak, would be using a variety of metrics to measure users' lasting engagement with individual applications. "This would force app developers to create a better, more relevant and more engaging experiences, leveling the playing field between small indie outfits and large app publishers. It would also mean that engagement is a prerequisite to discovery," Pietrzak writes.

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