Wanda was scary as hell. Especially in one part of the movie.

...attacked the Illuminati? One of my fave scary Wanda moments was when America asked where she was and she suddenly appeared in the dark, eyes glowing red, like Bloody Mary or something. Also when she climbed out of the reflection with her body all horribly contorted. Or when she turned around in a photograph to stare at other universe Wanda. I really love Wanda being creepy.

If she gets a solo film it should be a horror movie. Heck, this movie would've been perfect for a Halloween release.

...I didn't like that she was the villain. I've seen some intense hate for Wanda after WandaVision and this is almost certainly going to make it worse.

I kept hoping up until the final showdown that an evil Strange or supernatural entity like Chthon would turn up and Wanda would team up with Strange stop the bigger threat.

All of those things you said were very creepy/scary. But I think I found her the most scary when she took over the other Wanda's body and went on full killing mood. The scene in the tunnel when she was chasing Strange, Christine and America was like it was taken from a horror movie.

I have to admit that I wasn't a huge fan of Wanda. But after Wandavision I started to like her more. But I didn't expect that she was going to be the main villain in this movie. I was torn with it. Elizabeth is an amazing actress and did so good with it. But at the same time I wanted a better ending for her after everything she has been through. Because it did look like she died in the end when the tower fell.

Is Wanda really gone?? I mean, she took all the building down on her??!?!?!? I refuse to believe that..