In a group with 2 friends put us on a team w/ I'm assuming another group of 3. The other 3 wanted to do all winston. So we said we'd oblige at least until we died, except I went Mercy. It was brutal for the other team as we immediately capped the point and just walked the payload in, I felt bad for the other team, but couldn't stop laughing at the same time.
After that game it kicked us out to find more players and matched us up with the same guys again. This time they wanted to do all Pharah. My friends and I all figured all mankey may work, but didn't have as high hopes for all Pharah. But we gave it a shot and yeah, that was much more easily countered. After we essentially let them cap the first 50% we had a legit comp though and just completely dominated them the rest of the match. 2nd cap we did 5 Winstons again, but I felt less bad this time since we made a troll team the round before and still came back to make the game not even close.
We were discussing, what do you think would be the best comp to deal with it? I was thinking a couple of pharahs, rein, bastion, mercy, and lucio. Pharah because winston can hardly touch her and then have the other 4 stick close together. Shield the bastion, power boost the bastion, and the additional heals w/ lucio would make it difficult to kill someone with a bunch of winstons.