I don't mind how they used Agatha as an "antagonist" and/or "anti-hero". I think it's pretty cool that WandaVision had the first MCU female on female final video game boss fight. I just thought Agatha's motivations were kinda lame. Here was a suggestion that would have made her a more compelling opponent for Wanda:
https://mashable.com/article/wandavision-agatha-fix-it/