A group with good intentions and ideals, but they sometimes take it too far.
But for a group that is so loosely united, has no actual rules, and no true leader, they are surprisingly tame. You would expect a bunch of energetic 17-25 year olds that can basically do whatever they want on the internet to be completely out of control, and sometimes they are, but for the most part, it's either absurd, ridiculous, comedic speech and memes, mostly harmless internet pranks, and a few actual well managed political and social movements. I think there is great value to be found in something like this.
What I find most fascinating about 4Chan, anonymous, ect. is how widespread their culture and sort of collective conscious is. I think it goes to show that culture and ideas have far more influence then you would expect, and I think there is much potential for good here. Imagine if the general attitude of anonymous evolved more into a more mature, responsible one, while still retaining the good values they have.