I am writing this to inform you of such system ready to playing. For now, I can share with you the link to out discord channel where this will be happening. As to how it works, we have a bot which takes people waiting in discord lobby and balancing them into teams based on class and their rating (in case of 24 or more people teams would be separated in different skill brackets for better quality of matches).
All you need to do to keep this system running and update your rating is to post 1 screenshot of a game in related channel and bot will automatically update the database. As you would start playing you need to register yourself and your classes with commands:
!mm reg (main class) (secondary class)
Don't forget that your first 10 games will be your calibration period where win/loss and your score impact your mmr the most. You are very welcome to come and experience this matchmaking yourself.
And after all,very important, when u get a mm role, read the rules in the #-mm-rules channel.
We will be grateful for all the advertising of our project and invite your friends, let's play! Thank you for your attention!
Rating table: https://docs.google.com/spreadsheets/d/1Z3GBcvfprEquNRHRa2ceiA0U1qBSslrFyBLbqbjV8hU/edit?usp=sharing