I am impressed with Amazon's App Store so far. I had a terrible description for my mobile application, Simple Charades, but whoever reviewed my application submission also wrote a nice description and "Product Features" section.
This caught me off-guard to say the least! The fact they put the time and effort to write these descriptions is huge. With Google, everyone just slaps spelling errors and poorly written English all over the marketplace.
Amazon seems intent on getting their store right. A downside I can see to this approach is that end users will have a harder time filtering out low qualityapps by their description - high quality apps are more likely to have well written descriptions on the Google app market.