I can't think of anything more pointless than a number based review, especially on the "out of ten" scale.
When you consider the fact that each individual person is different, each individual review site is different, each one is sponsored by different corporations, each one has a different community, each one has a different method towards how to approach the scale.. in the end, what the heck is the difference between an 8.6 and an 8.8? It means absolutely nothing. A game cannot "feel" like an 8.6 or an 8.8.
On top of that, the videogaming industry is the most varied media industry that exists. Is the 8.5 for Uncharted on the same scale as the 8.8 for Zelda TP? How can you even compare these two experiences with any sort of legitimacy? Am I going to like Zelda more because it's .3 better than Uncharted? Of course not.
Most other industries have already realized this. The four or five star rating will tell you if it's a well made film or if it's a pile of junk, and that's all a number scale should tell you in the first place. Giantbomb and a few others understand this with their five star scales, you remove many layers of subjectivity with fewer numbers.
In the end, the only thing that matters is how a game compares to other games that are similar to it. You can review Zelda against Okami, you can review Street Fighter against Mortal Combat, but you cannot review Katamari Damacy against Batman AC. This means you actually have to read the review itself (and more reviewers need to write reviews with comparisons in mind) or listen to word of mouth, much more valuable than any arbitrary number.