Public Service Announcement :)
If you're the kind of player who thinks teamwork and communication is irrelevant, because you're going to do whatever you want, you probably shouldn't play ranked until you have a better understanding of the game. It's kind of amazing how common this is, and I don't understand how people think it's ok. Even someone who isn't playing that well or is having a bad game can still help his team if he cooperates. On the other hand, no matter how well someone's doing, if they refuse to cooperate and group up, they are going to start being a burden to the team.