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

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[5] Tracer
Tracer is a fast moving hero which also means you need to be fast at thinking if you want to play her effectively.  Tracer also requires a lot of precise aiming that you will need to get used to.

Pulse Pistols:
Tracer's weapon has a moderate skill level associated with it, as aiming and reloading properly does take some skill.

Blink:
This ability allows Tracer to Blink in the direction she is moving to much faster.  Using this ability has a high skill ceiling to it and will take a long time to master properly.

Recall:
This ability puts Tracer in the state she was a few seconds ago including health, ammo, and position on the map.  Learning when to use this at key times is vital to mastering Tracer.  This ability also works synergistically with her ultimate.

ULTIMATE Pulse Bomb:
Tracer lobs out a very strong short range bomb that instantly kills most heroes in the game.  This ability combos well with her other abilities (Blink and Recall).  Using this ability is not easy and it can take awhile to consistently pull off successful Pulse Bomb attempts.