The common thread is "people ignoring mammets." when they don't, they are useless. All it takes is a healer and a dps to contest you on the other side, and suddenly your damage slows to a trickle. A lot of this "mammets do damage" is just based on people playing bad and completely ignoring a push, or on one side giving up on mid and overwhelming a tower early game. I've seen plenty of people try to use mammets instead of mid, and soon the tables turned because two oppressors + escort is far harder to counter.