Just to add a further thought that occurred to me as I walked to work. There's a common complaint that MCU villains aren't very interesting. I can buy that. But, something that the MCU does do well is make sympathetic villains. Whether it's someone like Killmonger from Black Panther, or Whiplash from Iron Man 2, or Tony Stark in Civil War (yeah, that's a very debatable point about whether or not he's a villain but, he's certainly sympathetic) or various other baddies over the years, heck, even Thanos himself, the MCU has been pretty good about getting us to care about the villain.
To me, Wanda is just another in that same vein. Someone who cannot move past their trauma and makes incredibly bad, self destructive decisions because of their pain. I do think it's something that the MCU does rather well actually.