what it is and why it works: You give a limited number of complaints so you have to be very careful who your complaining against. Also i'm assuming if the situation is investigated and it's found childish or irrelevant this could very well lower the credibility/ or amount of future complains. If the complaint is found to be true the player's account could receive warning notices/forum and or competition suspension/ temporary bans/ or even permanent banning. (they would then probably just buy another account but this would increase profit for blizzard AND hopefully teach them to correct their behavior)
This could also be a very effective method for dealing with map hackers (but you better be sure they're map hacking if your going to report them)
Players who report and are found correct could also receive commendations/ account accreditation from blizzard to further facilitate MORE cleaning of the community.
The commendation system also works brilliantly as a counter measure for the complaint system. If someone who has received a lot of commendations receives a complaint it can easily be overlooked. Players who have received a lot of commendations can also receive higher valued posts on the forums/ credibility, portraits, beta testing ect.......
Starcraft 2 can be an EXTREMELY frustrating game when you lose and you don't know why. It is also a dwelling pool for people who like to take out their short comings in real life on other players. I'm personally tired of seeing players rage, getting flamed back by equally immature kids and then quitting the game because this negative environment. It's bad for the player, it's a bad mentality to teach the opposing playing, and its bad for the community as a whole. We need to work to support each other and growing the game so that way it becomes bigger. With each rage quit and hate a player receives the community takes another chip away from its credibility in the esports community. I want SC2 to be that community again at mlg who is cheering the loudest, that the community is so possitive and pleasant players from all around will be drawn in. This is how we start this.
Then let us work together and stop cyber bullying guys :)