No
I have a lot of problems with WandaVision but making Wanda the actual villain was way more interesting than having Mephisto twirling mustache
Even with Agatha she wasn't behind it just causing problems
I had problem with execution but pleasin theorists wouldn't have made it better
Wouldn't Mephisto not be behind it all but essentially "just causing problems" as well?
That's what I don't get about the complaints that Mephisto would be a puppet master. If Mephisto was playing Wanda and others from behind the scenes with a Faustian bargain, his goals are not what trouble their "deal with the devil" causes. He'd be trying to earn their soul by giving them something they want, at the cost of unforeseen long-term consequences. The choice is theirs, the consequences are of their own making, the devil is just there to tempt the protagonist to get something at a cost.
The way we got things, Wanda is grappling with her mental healthy/grief and the corruption of the Darkhold as being the influences that cause her to use her power at the cost of the lack of perspective on the consequences of her actions (mind controlling people in Westview or causing her kids to even view her as a monster). It's still Wanda making selfish decisions that she is at least initially partially blinded to the realities of her decisions.
In that sense, Mephisto isn't even necessary to the plot to add what he'd bring to the table since it still could be tweaked with Chthon or the Darkhold calling to people and influencing them, making them dark promises with hidden costs. And Agatha was kind of fun but pretty shallow as an antagonist, so I think having a more fleshed out reasoning for her taking the path she did or how she was corrupted by the Darkhold and was manipulating Wanda more due to it, could have actually strengthened her role and they conclusion of the series, especially if they used it to tie more into the themes. Agatha and Haywards motivations are pretty weak in retrospect, so having another antagonist pushing them or manipulating them could have made things work better potentially.
