If you're trying to find an objective measure of 'quality', you can only really look to either metacritic or total sales. The idea is that by including a larger sample of opinions, you eliminate bias.
This idea is pretty flawed, since both groups and individuals are subject to bias. An elite group of reviewers can easily fall prey to groupthink, just as the mass market is influenced by advertising.
Nevertheless, if you really need quality to be objective, you have nothing else to fall back on. Though I think people are better off just accepting that it's just subjective.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.
