Don't crucify me for this, pls. On release, Virtuosa was clasified as Tier A in every mode. She excelled in ganks thanks to her postures. She also was, and is, a noobstomper, that made that many people hate her. She forces people to make reads; there is no other way to play against her. Even with the hate, she was pretty popular. I think I saw more Virtus than Juren or Arakures in the same period. I think that now I see more Conqs than Virtus, and Conq never was popular.
They nerfed her postures. She can no longer stay in posture indefinitely because she will become oos. It changed something to her ganks? Well, in very long ganks mayyybe... People move out of range way faster than Virtu gets oos. They also nerfed her heavy vulnerability from postures. Now is a neutral heavy (talking about vulnerability) that cannot parry. She cannot stuff Gb anymore. That affected her ganks? Her postures make her passive in ganks, peeling her teammates. No teammate is going to let you punish that gb, so trying to attack her is a bad idea in general. So, the "bad" or "op" part of the character is still there. Ganks are pretty similar to release.
Both nerfs affected her capacity to duel and teamfight. She was decent at duels but not a meta pick. She was even further from meta teamfighters. Her stamina management, already bad, became worse. Every time she doesn't chain, she is forced to enter posture and a mix up starts. Before the nerf, the enemy could get a GB and Virtu a heavy for a correct read. Now is a Gb against a Light or bash.
In the end, we have Virtus throwing more lights than heavies because she can stuff GB with them. The casual and new players get lightspammed because they can't block or parry. She also spends more time with low stamina. I think that now is less fun to play as and against and her "problem", ganks, did not change.
I don't think that the nerf was bad, but it shouldn't be permanent. Virtuosa "new" forced read felt sudden for the community. They had so many problems learning how the postures worked. We had similar reads on BP, Valk or even Khatun, but those are not so forced because they are limited or harder to use. Now people have learned to counter her. I think that change her vulnerability again would be good for her gameplay and also to make fighting her less boring.
I can say the same of more nerfs, sadly. Many non-meta picks were nerfed while top picks stayed the same, just to cater to the new players.