Finally found it. This text is written by Greg (former Joypad/Gaming, now freelance in France). He also worked for Famitsu Xbox and some other japanese publications.
"The scores of famitsu, how it works :
1) Famitsu is a weekly magazine. Thus there are 4 teams making one magazine per month, with one chief editor each.
2) Before starting testing a game, the chief editor and the reviewers have a meeting and discuss about the game. If the chief editor got special orders from the publisher (don't be to harsh or so) he tells them there.
3) The 4 reviewers play the game.
4) They go back to the chief editor the day the magazine is finished and discuss again. They each agree on the score they will give to the game.
5) The chief editor sends the scores to the publishers so they can comment about them.
6) If the publicher is not happy with the scores, he negotiates. For example : "All right, you are harsh on that one, but the next one you give me a free ad, ok ?"
There it is, it's not that difficult. I say "Famitsu" because I know it from the inside, but in Japan it works like that everywhere. The magazine get the images and infos MONTHS before the official press release, but wait for the publishers before doing anything with them. There is absolutely no research from them.
All the pages about a game are sent and verified by each publisher. If they do a feature about Devil May Cry, it will be checked by Capcom who will send back the page saying them to change a title or some texts...
I hope I did not destroy a myth"
