The official Matchmaking blog post

@hayhor Yes, but what seems strait forward is not always that.  I am a system designer personally, so I know for a fact that saying something is easy isn't always the case.  It's really easy to say "well just do this" than it is to actually implement it that solution.  There are many many variables to take into account that they probably aren't even mentioning in the post, and probably even more we've never thought about.  Just reading this short post made me, someone who already designs systems, realize there is more to MM than I even realized.