initially i suggested Thumbs Up/Neutral/Down, but i think some members nailed it better
have only one rating called "Game Experience:" with three different ratings: "Impressed - Satisfied - Disappointed"
the tags or written feedback can explain it any further if need be.
Impressive = I would seek out and recommend others to play with/against this player
Satisfied{DEFAULT] = I have no objections to playing with/against this quality player again, nor should other players
Disappointed = I will probably refrain from joining games with this player and suggest other players avoid them too
this solves the most important aspect of what the ratings system is meant to do; tell you if someone should be avoided or not
most players are CC are average and play average games, so there is no reason bothering with those ratings and nobody really cares about them. their is no confussion.
your ratings score would be the result of two numbers:
percentage of people rating you Impressive / percentage of people rating you disappointing
so your score would be something like 21% impressed / 10% disappointed for a score of "2.1"
an ideal score would be 25% impressed / 5% disappointed = "5.0" rating
an awesome score would be 33% impressed / 3% disappointed = "10.0" rating
these calculations will allow a greater spread in the point system so every playe doesn't basically have the same score like they do now (4.6 or 4.7 or 4.

ratings are per player, not per game, so players can improve their play to become higher rated and not be penalized for older newb/learning play which shouldn't affect their current rating. players have no rating for their first 8 games so newbs can throw off the scores.
also, players will have a rating based on the ratings they give, ie your a 2.1 rated player, and you give 3.4 ratings
this self moderates the feedback systems as players who give excessive Impressed/disappointed ratings can be monitored automatically. if you give half the people you play awesome ratings, then something is wrong; likewise for negative ratings.
!!players who go out of bounds with ratings will have their rating privledges taken away and all there prior ratings changed to Satisfied!!
this simplifies the system, one simple rating. also for average players you don't have to bother rating them as they automatically get the default average rating of satisfied.