There are people with a lot of energy, and then there is Tom Tango. He not only invented the Marcel the Monkey projections, but also runs the Fans Scouting Report project, which polls real people to report on what they see when they watch players on defense.
They thought Edgar Renteria was awful last year. Some thought Michael Young, surprise Gold Glove winner, was good, but some thought he was awful. Everyone liked Erick Aybar.
The sample sizes aren’t big enough to allow much authority to the ratings, but they are another data point in the endless drive to figure out who can play defense and who can’t.