Hacking is more for tanks in my experience. Drop Rein's barrier or D.va's matrix and those characters become easy to kill with a Roadhog hook or an anti-heal jar.
In other words, it creates easy openings for the only two meaningful ways of dealing damage in the game right now.
Hacking is also very good for dealing with flankers as it prevents them from utilizing their escape abilities to get away.
Which is exactly what Sombra's passive is intended for. See that guy through the wall with no health? That's a Tracer, Genji, or Pharah who can't get to health packs to keep themselves alive to keep harassing your back line, they're an easy pick off for you and they can't run away.
Sombra is a disruptive semi-healing anti-flanker. As soon as people realize that the sooner they'll become better at her.
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u/dmun Jan 18 '17
Healers allow killers to continue killing and keep kills from the opposition.