Ngl, Sombra before virus was added was still annoying but tolerable because you still needed aim to kill people and TTK was longer, but with virus the tracking requirement to get kills with Sombra went down EXPONENTIALLY, albeit it’s up a bit with health buffs, but any decent Sombra always leads with virus, and landing virus on someone who is completely unaware of you is easy as hell.
Sombra is just inherently one of the most toxic heroes to play against because there’s barely any counterplay to her invisibility, she can engage at any time she wants with frontloaded damage, and her counterplay relies on your teammates not having Wood 5 levels of awareness.
The entire kit is just designed to be both cowardly and a noobstomper, even moreso than characters like Moira.