I think there's nothing wrong with the system.
Most games aren't that special, so there are people that like the game or the genre and they give it marks 4 & 5 and there are people that dislike the genre/game and give it marks 1 & 2.
3 is right in the middle and that means that the games that got 3 don't really stand out that much. Those games obvioulsy didn't leave such an impact on the general public. On the other hand games with either 2 or 4 stand out, because they made a really bad/good impresion on people.
It's almost imposible for a game to have a rating of 1 or 5 anyway. If a game recives one vote for 5 point it would take seven votes of 1 to get the average down to 1 (and the other way around). For every 3 a game recives it would need two 5s to get the average back to 5 (but after a few 3s the number of 5s needed would increase). So generally a game has no alternative but to end up with a 3 (unless it's really that much better or worse from the average).
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