Except in a XvX game there are X times more players than in 1v1.
So 4v4 >>>>>> 2v2 > 3v3 > 1v1.
1v1 and 2v2 are the current standard for tournaments and competition for a reason; because they are both popular modes that don't suffer from (as many) horrible balance issues.
Like what is the argument here? I don't think anyone disagrees 3v3 and 4v4 are nuts.