Watch IDDQD play him. He switches of doom fist after like 2 seconds and gives some really good mcree gameplay.
A few specific points from this video. I’ll point them out by round.
1st round: He kites the Winston all the way to spawn rather than try and engage in a fight he’ll surely lose. Winston burns ultimate to accomplish very little and he gets the regroup with his team he’ll need.
Also once his team grabs point he quickly grabs high ground. Even though that high ground isn’t even that good he still has a huge advantage. You’ll notice as he holds high ground with his mercy he easily holds of the Zen and rest of the team with no trouble.
Last thing from the first round: notice when he uses ultimate for the second time he didn’t need 5 people lined up for a good dead eye. He actually didn’t see anyone, and he didn’t need too. His high ground+ultimate allowed him to zone a huge span and control a crucial part of the map. He basically zoned the entire team out of the point and when the remaineder of the rush came in he was already ulting and got an easy pick to stagger the team further.
Round 2: he used ultimate 3 times. First he tries to zone the point but gets stunned. Second time he uses the ultimate to shutdown a flank which is super effective. Last ultimate again zoning out the team with the ultimate. Didn’t wait at all to see anyone just knew he had strong positioning and that the enemy team would be forced to either rush to point to to regroup/help teammates and deadeye or avoid the deadeye and stay staggered/split that’s huge.
Last thing from that round. Notice how quick/comfortable he is with spending his flash bang on someone whose over extended. He catches the doom fist first (even though he probably would’ve died anyways it’s always worth it to secure the pick) and he catches the Winston in the middle of nowhere. No team and no escape. Kiteing in overwatch is super effective. You’ll see him do this as almost every dps (soldier, tracer, mcree)
Dva, Winston, dive hero’s are forced to chase him (because his damage output is too strong to let him stay alive. So he’ll just force them to chase him to a bad position/ let the tanks chase him to nowhere. You’ll notice all the time tanks and other heros will find themselves way out of position and away from their healers because he’s played his positioning so strong and they were so adamant to chase him.
3rd round: When his team first loses the point and they struggle to retake it he comes back and starts shooting for a pick. He quickly realizes that he needs to go fight them on the high ground instead of shooting at them from below and exposed. (His team dies though so he’s unsuccessful.) but as soon as his team captures point on next push he quickly takes high ground for strong positioning.
I didn’t cover all of it and sorry for the super long essay but hope this helps in any way.