Sombra in lower ranks is the most oppressive Hero in the game by a long shot

Healers get picked off and DPS refuses to acknowledge the backline and screech for heals while they hobble from spawn just to get picked off again. You can't prep because she is always invis. The healers even together can't defend because of hack, her high dps, and an obscene health pool for a flanking based character into a teleport to immediately go invis again. To find her personal healthpack. For a similar kit Tracer is 175hp to Sombras 250. And on top of that Sombra has one of THE BEST ults in the game

She is Blizzard's Mary Sue baby

A decent Sombra needs the entire team to stay close and bring up teamwork that just isn't there for solo queue.