Let's be blunt: Amazon's reviews sometimes suck. Many of them are hasty day-one reactions, others are horribly misinformed and a few are out-and-out fakes. The internet shopping giant thinks it knows how to sort the wheat from the chaff, however. It just launched a new machine learning system that understands which reviews are likely to be the most helpful, and floats them to the top. The artificial intelligence typically prefers reviews that are recent, receive a lot of up-votes or come from verified buyers. Amazon hopes that this will show you opinions that are not only more trustworthy, but reflect any fixes. In other words, you'll see reviews for the product you're actually likely to get.