This basically sums up Famitsu's attitude towards reviews. From the Persona 5 Famitsu review thread (39/40):
Famitsu is not an objective or reliable source of reviews. They only get attention because they're the only game in town for Japanese review scores.
It's not just that.
The way Famitsu reviews work is that they review games based on how they feel people should perceive and react to them. For instance, if they feel that a particular game should be given more attention, they'll give it a high score. Several years ago, when the Japanese game industry started declining, they ramped up the number of perfect scores significantly, because they wanted people to start buying these games. So it's not necessarily that they're doing it just for money, but also for other reasons. Just not necessarily related to game quality.
Of course, they also do tend to give more favorable reviews to games whose companies have purchased a significant amount of ad content in the magazine as well.
In terms of review content, they have literally been pretty terrible since they started in the 80s. They're very short reviews that read like back-of-box quotes, giving very little useful information about a game.
Famitsu is not an objective or reliable source of reviews. They only get attention because they're the only game in town for Japanese review scores.