It is a great idea, in fact, I think that the Minna no Nintendo Channel (Nintendo for everyone) just released in Japan so far does actually something like this.
http://www.youtube.com/watch?v=tbvSh1Pt-iM
Where you can download demos for the DS and give some short of opinion about the games that you play on your Wii.
I think that they were talking about something like, you play a game, and you give you're age so another gamers could see the average age of the user of that game.
also I think that they were talking about showing which games have been played the longest hours on the Wii, so people could see the most played games on the system.
We'll have to wait as usual to find out
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