I'm not sure how useful that is. It's not like gamers' opinion about games are hard to come by. Gamers are very vocal about their opinions, so any game developer looking for feedback can just go to Steam/Reddit/NeoGAF/whatever and read to their heart's content, or maybe even communicate directly to their player base.
What people say/believe they like isn't necessarily consistent with their behavior. Data-mining with sentiment analysis might be useful. ("'Wows' dropped 1.3% and negative-sentiment profanity rose 0.5% after the latest patch.")
