
There's a movie teaser line that you may have seen recently, that goes like this: "What if you had to tell someone the most important thing in the world, but you knew they'd never believe you?" The answer is "I'd try." The teaser's actually for another movie, but that's the story that's told in the documentary "An Inconvenient Truth": it starts with a man who, after talking with scientists and senators, can't get anyone to listen to what he thinks is the most important thing in the world. It comes out on DVD today.
I'd say that's one of the biggest reasons that Tycho and Gabe are so respected. I know that Tycho likes computer games of the strategy variety and Gabe prefers action packed consoles, and so when I read their opinion of a game, I take into account the reviewer and compare their personal likes to mine. Generally, I like games that Tycho recommends, and know that if Gabe really enjoys a game, it's probably not going to be my cup of tea.
The best thing that a review site can do is provide an easily accessible background on each of the reviewers, containing the genres they like and mention specific games which they have liked and disliked. Also, provide and easy way of identifying particular reviewers, such as the picture icons PA uses. Eventually, people will figure out what reviewers they agree with and trust.
In any problem, if you find yourself doing an infinite amount of work, the answer may be obtained by inspection.