It sounds as though the system you're proposing could only be effective provided the people using it have played a wide array of games; how else could you get an accurate indication of a game's quality unless it is compared to as many other games as possible?
Take, for example, a handful of 10 people who have only played 3 games; let's say Modern Warfare 3 is one of them, and these 10 people all put MW3 in their top spot. This is going to translate as 'Modern Warfare 3 is the favourite game of 10 people'. How is this indicative of a game's quality? It just means that they liked MW3 more than those 2 other games they've played, but this will show up on the website's ranking system as 'Modern Warfare 3 is totally awesome', when this isn't necessarily what the original information was suggesting.
Furthermore, this would detract from Metacritic's use as an aggregate review website; If I go on Metacritic and see a game received a score of '90', that is a piece of information which I can readily use and make sense of. With your method, the only thing the website would communicate to me is "This game is better than these games". What if I hadn't played those other games? That piece of information would be utterly useless to me.
So yeah, I don't like your idea. Metacritic isn't perfect, but there's no sense in making it even worse by introducing some convoluted and ineffective method of assessing a game or any other product's quality.
Take, for example, a handful of 10 people who have only played 3 games; let's say Modern Warfare 3 is one of them, and these 10 people all put MW3 in their top spot. This is going to translate as 'Modern Warfare 3 is the favourite game of 10 people'. How is this indicative of a game's quality? It just means that they liked MW3 more than those 2 other games they've played, but this will show up on the website's ranking system as 'Modern Warfare 3 is totally awesome', when this isn't necessarily what the original information was suggesting.
Furthermore, this would detract from Metacritic's use as an aggregate review website; If I go on Metacritic and see a game received a score of '90', that is a piece of information which I can readily use and make sense of. With your method, the only thing the website would communicate to me is "This game is better than these games". What if I hadn't played those other games? That piece of information would be utterly useless to me.
So yeah, I don't like your idea. Metacritic isn't perfect, but there's no sense in making it even worse by introducing some convoluted and ineffective method of assessing a game or any other product's quality.