McCree is a revolver-wielding BAMF in Overwatch. His precision shots and quick draw skills will make any fan of westerns and cowboys delighted. His play style revolves (heh) around using his skills and attacks together.
If you like pistols, westerns, or want somebody with great skill and weapon synergy, McCree is the guy for you. I'll go over what you need to know to become great gunslinger.
Jesse McCree started as an outlaw in the Deadlock Gang, which did illegal activities in the American southwest. After he was busted one day by Overwatch, he was given a choice -- to go to jail or use his expert skills in Blackwatch, Overwatch's covert ops division.
He eventually came to enjoy his new job and thought he could make up for his past crimes, until Overwatch began to lose influence. Some of Blackwatch began to try to take down Overwatch, and McCree wanted no part in the upcoming battle.
After he left, he became a mercenary years later and only took jobs he believes are justified.
McCree is an offense character and only job is to attack and defeat enemies. You can just shoot and use his alt. fire, Fan the Hammer, but using his skills correctly makes him much more effective.
That's all for my tips on using McCree in Overwatch. Let me know if you have any questions!