Something needs to be done about rank MM

I have been having to many of these, my team either goes 5/30 or 30/5 matches, where its either we get stomped or we stomp. I have no idea why but it has been happening a lot this new season. Not sure if there are as many other people who are experiencing this or just a few. Very annoying and frustrating getting these sort of matches. Also boring when you just decimate an enemy team.