Video games are often known for their gunplay. However, not all shooting games are the same. The simple aiming and firing mechanic is creatively combined with other aspects of play that greatly alters the experience.
While some games add novel or fast-flowing movement to augment the shooting experience, Hero Shooter games expand the experience by offering different characters to play, each with specific abilities and shortcomings.
In the same way that fighting games encourage players to move an intricate move-set of a fighter (to become their "main" on-screen avatar), character-focused shooting games offer a wide range of styles of play across a diverse cast of people.
This not only adds novelty to the otherwise repetitive nature of shooting games, but changes how they are played more generally. While you may go head-on at enemies in a tank-style character, a medic, ranged attack or specialist character will need to be played in different ways.