After playing a game with 3 self-admitted throwers on my team, followed by a positive team who all had fun and comm'd well together, I had an idea.

I think it would be a good idea to implement commends, maybe for specific things like "good comms, team player, etc". If you have a thrower or someone toxic on your team, you can report them and maybe if you are lucky they get comm banned, but there is no way to give positive feedback to the good teammates you have. In a game with an insane amount of throwers, smurfs, and people who don't comm, I think it would be a great addition to allow you to give positive feedback.

Additionally, the game could queue players who get lots of positive feedback together to encourage teamplay and positivity, and queue comm banned or throwing teammates together. This would make it so if you are a good teammate, you are far less likely to get throwing or toxic teammates. On the flip side, if you are toxic or throw then you are going to be stuck with teammates who do the same, which would discourage that behavior.

Edit: Just to summarize the idea here and clear up some confusion. If you play with a good teammate, you should have the ability to commend them and essentially tell the game "Hey, this guy was a good teammate, I would like to be queued with him in the future". Now to prevent negative commend bombing, you would only be able to give positive commends. If you have a toxic/throwing teammate and you want to tell the game "this guy is an asshole I do not want to be queued with him ever again", then you use the report functionality. In theory, the game should take commends and reports into consideration and attempt to matchmake you with players with a similar level of both, thus sticking toxic players together and making it less likely to queue them with people who are good teammates. These wouldn't be fixed queues with a quota of commends to get in, but just a preference in matchmaking that makes it more likely to play with good players if you are one yourself.