I don't think you can break up a (game) review in 'logical' pieces. It's supposed to be a complete experience.
The reason for the breakdowns is for a quick summary of each element. e.g.
Consumer 1 -- Only wants final score
Consumer 2 -- Wants quick summary of what they should expect, pro and con, from the basic elements of the game (sound, graphics, longevity, presentation, etc)
Consumer 3 -- Wants long, detailed review covering each element of the game, and the game as a whole, in lengthy detail
Also, some gamers are more interested and/or inclined to different elements of a game. e.g. I could care less about graphics, but I want to know how well the game compares/relates to other games in Longevity and Story. An overall score may only represent the reviewers leanings towards graphics = better, whereas personally longevity = better. (Of course I am a graphics pig, so this is falacious!)
The difficulty is finding a good balanced of "what matters" and putting it into a form that is appealing and usable to a wide range of consumers. Of course ultimately "is it a good experience" is the ultimate question, but that will widely vary not only no the weight placed upon each element of a game by individuals, but by individual taste--which know no bounds in respect to reviewer score. Heck, the bloodlust anti-Sony/MS hate here clearly trickles down to game tastes on these forums at times... there is no reasoning or explaining taste, and not even a final score can convey the "experience" of a title universally. So a final score, expressing an opinion of a person or staff, with individual less(er) subjective scores based on individual elements can be useful. But in the end: Read a couple reviews, and if in doubt, rent.
Good post and I couldn't agree more.
Thanks