5 Winstons and 1 Lucio is great. Give it a try when you can! No joke. The other team do not expect something as preposterous like that. Just make sure you turn 180 degrees when you're jumping at a Widowmaker so she doesn't headshot you.
I've barely won a game against a team including a Reinhardt, a Winston, and a Zarya on Dorado (they were attacking). The only reason we won is cause I had 5:53 objective time just jumping around the cart.