The problem with reviews like these is that most people only respond when they're not satisfied or have some sort of vendetta. The results end up being pretty skewed because you just don't have a good sampling of people.
That site got their numbers from a survey on a web page so the people that do answer it for the most part are going to be those people that have some sort of bias.
People always have bias, I don't know the site so can't say how bad the bias is..
Yes, people always have bias but there's an added bias when it's a completely option survey like that. Most of the people that answer will have something negative to say, that drives to them to speak out. When they're happy, they're not as driven to speak out.