How do leagues work?

[onealexleft]

But in all seriousness, I've been working on the league system since release. Admittedly, the less visible portions. But I've deployed tons of fixes involving matchmaking to help improve that as much as possible, but we don't post about every tiny fix. The more visible stuff will usually have to come in a client update, but I've definitely got the ladder points on my list of things to improve on in an upcoming update.