Since the topic of changes to reviews is coming up I'd suggest the site takes a satisfy the majority approach.
This means get people who enjoy genres to review those genres. RGP players want to know what another RPG fan thinks, same for FPS, etc.
Drop the categories for scores - categories need a resonably solid level of consistency to use - if one reviewer sees value different from another the use of the category is shot
Focus on the words (ignore the 'sound bite' generation and have sections in the review for the basic building blocks of the game (gameplay, presentation, sound, etc).
Provide a single score out of 100% that represents the reviews view of that title vs its peers and make sure reviewers stick to that notion. So how does KZ2 score as an FPS title with SP, offline bots and MP vs its peers? How does Eternal Sonata score vs its peers as an RPG?
Again, I'd recommend agreeing a control game to score against. Pick a popular title that most people agree on as the control and go from there. So for example pick Daxter as a PSP adventure game, score it, then compare similar titles to that score. Same for say Halo 3 on Xbox.
Encourage people to read the review vs the score, and use this simply as a placemaker vs industry averages - i.e. Haze is an average FPS and gets 60% as a result as its an average game with issues with presentation, gameplay, etc.
Make sure reviewers start with a summary of the whole review, then proceed through each major area stating good/bad, etc. and conclude with a shorter summary of the game. In this summary you should stick an opinion on the game's value. Note Value should not (and the current system I'm afraid IMHO is broken for doing this) be a score nor quantitative but an opinion for that title vs its peers and expectations. If handled right this should avoid the short = low value. Right now the site is linking value to a player's purchasing power, which is wrong. I know value is to help here but it must be relative and the reader must decide themselves how it applies to their own purchasing situation.
Again, I'd say most reviews I've read are good as written, its the scoring and elements of approach that let things down somewhat.
IMHO of course...