McCree is really fun hot jelly
I hardly use fan the hammer because his M1 is godly, I finally got the sensitivity just right to average 45-60% accuracy per game, and because his headshots are way more satisfying and can chunk harder than his fan the hammer.
The true McCree wombo combo is Flashbang, headshot, melee, m1 or roll, and then melee.
Like god damn getting the well aimed headshot and chunking 140 HP is always fun as hell to do, especially on tanks who think they're safe because of HP pool and D.Va's who have the world's easiest headshot hitbox.
Also on tracers and zenyatta's who can just be flashbanged and headshot for an instant kill, every time, all the time.
edit:
in a bind, using your ult, not actually charging it all the way, and firing is almost always way more useful, as you can roll, use your m1 to finish the job (or a flashbang which is way funnier)