Last weekend Amazon changed (updated?) the way it ranks reviewers on its site. On the whole, it seems fine to me. For one thing, it's their site and they can rank any way they see fit.
The biggest change is that if someone consistently gives a reviewer positive votes, they're listed as a "fan" and their votes don't count. On the one hand that seems fair: the end of block voting. On the other hand: it assumes that all "fans" aren't rating a review on content but on their relationship with the reviewer. Then there is the opposite of fans, what someone on the Vine Forums referred to as a "nemesis". And what about the yahoos who vote based on whether they agree with the opinions expressed?
There's probably no easy way to manage this.