If you mean for IW, I haven’t seen hate yet. Perhaps some people are bitter about Wanda not killing Vision earlier, but whether she would or not made no difference because all the heroes were in agreement that nobody should have to kill Vision, and they’d rather fight. Not to mention, once Thanos got the Time Stone, it didn’t matter when she did it.
If you mean from before, there are two camps:
- People who are angry at how the character was adapted. She is Romani in the comics, and Marvel cast a non-Romani woman, and had her working with HYDRA. This is a subject I’m not going to get into it this moment.
- People who are angry that Wanda messed with Tony and Tony gets full blame for Ultron but Wanda doesn’t.
For the record, I agree Wanda is also responsible for Ultron, it’s just not as important to her character arc anymore, because it’s her origin story. She was narratively punished by the death of her brother and the destruction of the home she was trying to save. It’s the final piece in her becoming an Avenger. That’s why no one keeps going back to it. For Tony, though, it’s a part of an ongoing character development.
As for Vision, that’s mostly people who don’t like his relationship with Wanda for the most part. That is about two things usually:
Those Celestial Bodies 