Reviews are a very important part of the industry as far as the press side is concerned. The actual numbers, however, not so much. The problem is that the numbers are essentially a requirement these days. As others have said, it's not totally unnatural to be concerned about the actual numbers a game gets even if the general feeling of the review is overly positive. Sometimes you want a game to get a high or low score because that validates your own view. Other times, you want a game to get a high or low score because, whether you've actually played the game in question yourself, you realize that high scores often mean more sales and attention while lower scores mean the opposite.
My own personal issue with the numbers is the (omnipresent) hypocrisy of the gaming masses. They complain when a good game gets a 6 instead of the supposedly deserved 9. They then complain when 7 is taken as essentially the nadir of quality. They then complain when supposedly amazing Game X doesn't get a 10/10.. before complaining when Game Y got a 10/10 but shouldn't because 10/10 actually means a game is perfect and while Game Y was pretty good there's no way it was perfect.