Easiest and Hardest Overwatch Heroes to Master
From Easiest to Hardest ( [22] to [1] )

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[9] D.va
D.va is somewhat difficult because her abilities gives her many different opportunities to choose from and one must make better decisions if you want to be better with her.

Fusion Cannons:
D.va's mech is equipped with a rapid firing gun that is actually one of the easiest aspects of her to master.  This is because her gun is very easy to aim due to the large hit radius with no reloading.

Boosters:
This is where the decision making comes in.  With the ability to boost every 5 seconds one must make better choices with where to boost to.  A lot of this is map knowledge and some of this is basic offensive/defensive skill.

Defense Matrix:
This ability blocks incoming enemy fire and projectiles.  Knowing when to use this will take some experience.

ULTIMATE Self-Destruct:
This ability explodes D.va's mech and kills anyone within the explosion's line of sight.  There is a lot more to this ability than just pressing your ultimate hotkey and hoping for the best.  D.va can launch her self-destructing mech by using her boosters first.  There is so many strategies for launching the exploding mech that have yet to be discovered yet.

D.va in Human Form:
In human form D.va is still quite powerful with her blaster gun.  Her blaster shoots projectiles that will take some aiming practice to get better at.