See, I'll have to side with Yahtzee on this one, both in that you should read a whole review, and that breaking apart the scoring system would be a good thing, because there's far more to games than what they once were. They are not just a simple product, they are far more intricate now, so objectively rating a game becomes not possible due to how many layers exist within these games. Take a game like Fallout New Vegas. Plenty of bugs and brokenness in this game, and yet the roleplaying is great, the combat has depth, there's multiple different ways to play the game, etc. How would we objectively review this game? Do we look at its bugs and say it's a 5/10, do we look at the play style, the gameplay itself, is it great for being deep, is it bad for being too complicated, if it's good for providing more options, how does that fair with a game like Mario, a tight platformer, but a rather linear and straightforward game, would it lose out due to it's lack of depth, how would this all work?
See, everyone speaks about having an objective review, and yet there is no way to boil a game down into one numerical score objectively. You have to make assumptions, biases, opinions, all varying depending on the game, because each game should be reviewed for what it is alone, and due to the vast amount of different games that exist, there is no way to boil it down into one simple system to rate games. So, the only solution is to break things up, understand certain aspects have to be taken with general bias, or drop the system entirely, and maybe go with something like Eurogamer's "recommended, essential, whatever" system, and include what those badges would correspond to just so it's a nice summary to know if the review is worth looking into, and drop metacritic as well. The problem with aggregated scores is that trying to base your own taste on general consensus is a horrible idea, and to be an educated consumer, you have to be willing to go in depth on what you're buying. The critics say Final Fantasy XIII is a good game. Objectively speaking, it works just fine. Ask any Final Fantasy fan however, and they'll tell you why it's shit, and even provide a laundry list of valid, objective reasons as to why that is. So the only way to even be close to having an idea of if what you are about to buy will be good is to find a reviewer, or sets of reviewers that align with your tastes. That's the smart way to go about being a consumer.