I have seen C9 counter it on one point with bastion in a tournament, which ended in C9 switching off of it the instant they lost the point once, they ended up winning that point but were on double tracer double lucio double winston again at the end. The thing is not that it's unbeatable, but it is used in an overwhelming amount of games and a game made up of three heroes is really really tedious to watch and also doesn't make for very interesting gameplay if you ask me. Also i said its problematic not that its unbeatable.
Do you have a source for the games you mentioned? would be interested in watching those.