The OPR matches can get really unbalanced. Lots of premade 5 man squads get paired with other premade 5 man squads and all the solo’s get put on one team; resulting in an unbalanced OPR in which one team wins 1000 to 200.
I think there should be a separate 5 man squad only queue and a solo/duo queue. I know having two separate queue’s would not be a good thing for small servers. Maybe this can be fixed by having a region wide OPR queue instead of a server lock.
The other way to do that is to alternate team assignments for groups that are joining so that premade 1 goes Red, premade 2 goes blue, premade 3 goes Red, etc…