One with customer reviews anywhere is read the comments! Joe thought it was a 10 because it had a great pool. Fred then rates it 4 because they only had back in sites and he didn't care if they had a pool!
From the comments you get a much better picture, maybe what Fred didn't like is what is important to me or another site I really want a pool/spa and a right says they have one but wouldn't get in it with how bad it looked!
You get the idea, problem with commercial rating systems is to try and be consistent and as fair as possible they have a table with certain requirements and qualities that get certain scores. So 2 parks can get a good number because they both have a pool. However one is closer to an over grown spa that maybe 20 people fit in all standing up. The other one looks like they could hold the Olympics in it! Big difference but the straight numbers won't show that.