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

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[19] Bastion
Bastion is really simple, you move around and shoot things and sit still and shoot things.  The strategies are relatively easy to learn, he just takes a bit of aiming practice and knowledge on when and where to use his Sentry mode at and you will be okay with him.

Recon Mode:
Bastion is sort of a transformer, transforming into various modes.  His default mode is Rocon and he simply moves around while only being able to fire his gun.  His gun is hit-scan, meaning there is no projectiles, bullets instantly hit the target you shoot at, which makes aiming more simpler, but still requires some practice.7

Sentry Mode:
Bastion's powerful defensive mode, Sentry is just as easy and nearly the same as Recon except you will be stationary and simply aiming at enemies with a powerful gatling gun that is also hit-scan requiring only a bit of practice.  What's more difficult is learning where and when to use Sentry mode at, which shouldn't take a long time to learn.

Self-Repair:
Low on health?  Simply repair the damage up.  Very easy ability, not much to it.

ULTIMATE Tank:
Bastion's ultimate turns him into a tank which fires explosive cannon balls that do AOE splash damage, not too difficult to get a hang of.