If I may add my $0.02 cents here I would love to. While I agree with you Ghost on the whole mute ban thing is a ticking time bomb for abuse and spam, I'd like to quote what you said on Bungie.net: "Some of these are getting banned for quitting a game too many times, or betraying team mates. These bans make sense. Quitting a game or betraying a team mate is ultimately a single persons fault, their own personal fault."
In all due respect Ghost, I am going to have to disagree on this. My LIVE connection is not the best, and at times in the middle of a game, it has disconnected my brother and I from our game. Which in turn, gave us negative experience points; and a 16% negative rep for "Quitting early." I can't help it, and the fact that I get penalized for something I can't control is completely absurd. I also have a thing with betrayals. While I never betray my team on purpose, there have been times when I have accidentally killed them. 0ne was that I threw a grenade at a zombie, but as soon as it was flying towards its undead target; a player and his guest get right in front of it and causing the grenade to bounce off of his back and land directly in front of all of us, causing the grenade to explode at its unintended targets thus killing me, the two players, and my brother. While I prayed they would understand and I tried to tell them it was an accident, I get the message: "You have been booted for team killing." I tried to send them a message to explain but to no avail. They simply did not respond, and they gave me negative rep. I hate getting negative rep for something I didn't mean to do. It makes me feel awful that players want to avoid me for an accident.
Also, is Bungie going to do anything about the current problem with people who already abuse the rep system? I have 15% negative rep for "Trash talking." This happened one day when I was playing Slayer with my brother and our friend against a three-player clan. We won and we said "Good game" to them. Yet as soon as I checked my rep I got negative rep for Trash talking! I was stunned at the immaturity this clan had! Its completely sad that these sore losers can't handle the fact that they lost, and they abused the rep system just in order to put down my team EVEN after we said "Good game!" I just hope Bungie can at least try to do something like have proof that so and so did this and that before it automatically gives said player negative rep.