I posted a kind of idea about this in a thread for deleting Gamerscore, but it was a bit off-topic there.
It would be cool if Microsoft added the ability to go throguh your played games and add Mini-Reviews to each game on your games played list.
Nothing fancy, maybe a little 5 Star ranking option and a 100 character text field.
This would not add a significant amount of size to a user's Profile. If a person owned every game available in stores, and arcade game from marketplace it would be a bit over 0.5MB assuming they used the full 100chars for every review.
It would be a cool way to get to know what people think of the games and what kind of player they are in general.
As an example someone looking at my profile to see the games I have played would see my gamescore in the game and the additional information like in the examples below:
Need For Speed: Carbon - 2 Stars - "Rental, Didn't like the controls, found game boring."
Oblivion - 5 Stars - "Loved it, bought all the DLC. RPG Goodness. 350+ hours."
Crackdown - 4 Stars - "Fun game, I liked getting beefed up and going on rampages. Wished Sniper Rifle was more useful."
GTA IV - 2 Stars - "Let down. Preferred SR and SR2"
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Game Mini-Reviews