She is right.
- He profaned the tomb of her grandfather and grand uncle.
- He killed her former master.
- He tortured and killed many innocent people and especially children.
- Attacked Konoha.
- He was one of the greatest criminal.
- Developed immoral jutsu for selfish purpose.
The only " good " thing he did, was to reanimate the 4 Hokage during the 4th Ninja War. But It wasn't even his primar will. He was just following Sasuke. If despite of Hashirama's speech, he decided to venge himself against Konoha, Orochimaru would have followed him. ( but Hashirama was there so he would have been stomped)
Orochimaru should have been killed. I don't watch Boruto, but I am sure that he is planing to do some coup.