We just rolled out a hotfix that should improve matchmaking times for most players. We're still diligently working on the overall scale of the problem and we'll be making more improvements to this in the future, but for now this should help out immensely.
Thank you all for your patience as we push through this explosion of new players. We're so grateful that so many of you are giving us a shot and we're committed to delivering on our promises to you guys. Go Minimum!
Check out the patch notes here: http://steamcommunity.com/app/214190/discussions/0/616187839287599908/