Likely, it's trying to show a helpful good and a helpful bad review next to each other. Amazon, etc all do this as well. I guess they haven't had as many issues with people exploiting it because you can rate reviews as helpful or not. Google should introduce a helpful or not helpful up/down rating for reviews which should solve this problem. Or a "This user is an idiot" button that, if enough people click, the review is thrown out. And, if enough people click it on multiple apps for the same user's reviews, they are banned from reviewing.
Actually there is such a helpfulness rating; thumbs up/thumbs down option for every review. I did not check on phone, but Google Play for desktop has that kind of system. I guess the problem is... nobody cares to vote.
I think the issue is most people don't use Google Play on the desktop to look at reviews and such. I have, I think, once. I generally only use Google Play on my Android devices.
