I fear that Microsoft have failed to see the big gaping flaw in this and that is the feedback system itself.
You could be the nicest human on Xbox LIVE, always interacting nicely with the community, and yet you'll still get negative feedback from all of the douches you kill in Call of Duty or Halo claiming that you're hacking.
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I don't get this complaint Ive remained at 20% avoided after being on xbl for about 4 years. and most of the people who avoided me were because unsporting which i probably deserve. (If one person t-bagged me in a game every person on their team received a t-bag in return lol)