That might be because of the type of game it is...
It's sort of like how Ace Combat always got an 8 because it was geared for a specific type of player.
Despite the fact that this forum is so big, you all are the only other people I know that actually play CV titles. All of my friends are sport game sickos. They'll WATCH someone play a game or series like this, but won'y pick it up for themselves, which is foolish. Unforunately, sometimes the wrong people put together reviews. Maybe they lack historical reference or appreciation.
Most of the greatest games take an 8 or a 9.
it all comes down to opinion, the "wrong" people that put together reviews are "wrong" because you think so, because for example you like the game, while you might agree with the other reviewer because he has the same opinion as yours, for example some people look at video games as a way to just pass some time not the ultimate form of pleasure and story-telling, and these people as I have seen are more attracted to sport games and classic Mario types.
for example the same thing happened to Tenchu Z reviews at IGN, they said that game is flawed and the AI is stupid and all and gave it a low score like a 6 or something, now I ignored the reviews and actually got the game, and to me the graphics were cool, and the "flaws" that he was talking about was the exact appeal of the game. because everyone can define a video-game flaw in a particular way, for example is Mario flawed for not being realistic enough in terms of sewers? sounds like a stupid questions? well apparently some reviewers have this view.
and for the record, I hate IGN reviews. I see way too much hypocrisy.