Apple need to improve the description pages within the app store and the analytics that developers are provided with.
On Google Play I have more freedom to optimze my page which makes it easier for users to find what they are looking for as the selection has become tough given how bloated the store is.
From a dev perspective the reporting is unusable, luckily Google Analytics is really great (although its not available on Windows Phone).
Interesting article, when I read the headline my thoughts were: What about Living Social the company that Amazon has written off as a dead investment that cant IPO and will be gone well before Groupon?
There is a lot Groupon can do to perform and the huge war chest they built from the IPO has given them a great runway to do so.