Considering that we don't know which criteria the person is using to base his ratings on, we can't know.
The only thing we can say, is whether or not our own personal criteria match the rating given.
Everybody is entitled to their own opinion, even if their opinion wildly varies from everybody else, the fact that you don't like this particular opinion, and are apparently trying to stop it, is imo just as bad as anu whining about everybody else not allowing him to have His opinion.
An opinion is one thing. That opinion needs to be grounded in reality though. If this voter is not capable of delivering a flawless and ground-breaking match themself... then they have no business dishing out grades like that!