Stuff said by Dhruin and Screaming Life
That's the problem! What's the point of using a 100% or 10 point score, if you're not going to actually use the 'mathematics' involved with such a score? I mean no offense to you, Dhruin, in saying so.
Wouldn't it be better to use a scoring system that didn't come with the arbitrary numbers and used instead general, unarbitrary (to a point) terms like "Great, Good, Average, Mediocre, Totally Crap" with criteria like "Longevity/Addictiveness, Visuals, Audio, Gameplay, Overall (short for Overall Feel, or Value)". A game like Quake 3 would score high on Visuals, Audio and Overall but it might plummet in regards to Longevity and Gameplay. A game like Avernum 3 on the other hand would score poorly in Visuals and Audio but rank high in Longevity, Gameplay and Overall. Overall would be the most important criterion but it wouldn't be the 'mathematical result' of adding the other 4 criteria.
After all, how one might rate a book, or a music album would be quite similar, and many magazines do it. Some of them just use stars to represent (as legend) for "poor, mediocre, average, good, great" in each criterion.
When you look at a score for a game these days that says 80% it's hard to tell if it's 'average', 'good' or even if it's 'great' because the score is nothing more than an illusion. It would be much better if specific criteria were listed and specific terms were used to define the actual 'score' of a game. Rating a game's graphics at '60%' when you intend to mean that it's 'utter crap, looks like it belongs in 1997' requires a pointless amount of translation on the reader's part, and the job of the magazine or webzine should be to provide the reader with a specific, and informative review. They shouldn't confuse people. At worst, they end up recommending a poor game to an unwitting gamer who spends his hard earned cash on something that would have been branded as crap if it wasn't for the deceptive practice of %-based review scores.
Just one example will do.
Adrenaline Vault, back in its heyday when Pete Hines used to write for it. They stopped reviewing games and serve as little more than a hardware advertising site these days. In their defense, however, all the hardware that they review is top notch, as they stay away from mediocre hardware.
Edit - examples:
Betrayal in Antara (3/5 stars) reviewed by Pete Hines
http://www.avault.com/reviews/review_te ... bia&page=2
Average game. Nothing special, nothing bad, either.
Arx Fatalis (2/5 stars) reviewed by Jack King
http://www.avault.com/reviews/review_te ... tal&page=3
Nothing bad, but again, nothing special. Has good qualities, but it also has bad qualities in it like the magic system and eating food, too. Regarded as "Average" everywhere else, yet given scores as high as 85% with a minimum of 70% in most places.