Personally, I don’t understand why people would choose to play this game by themselves, when the developers have done a pretty good job at making team based play work well together.
That said, there seems to be an abundance of solo players that deem the game “unfair” when they have to go up against pre-formed groups. So what I would like to suggest is perhaps a game setting (found in “options”) that makes it to where solo players will not be put into a game with pre-formed groups, either on their team, or against them.
This would be a completely OPTIONAL setting.
This would allow those players the option to play without teamwork affecting their games, and for teams with pre-formed groups to not have to deal with what may or may not appear as “toxic” players, as the solo players with that mind-set will have their own lobbies.