Not the best Marvel movie. Fun but lacking.
As for tropes not being bad just because they're tropes. True. But some tropes are bad in and of themselves. The Crazy Woman trope is old, and tired, and sexist. Now, for me, a lot can be forgiven if something is done well. It was done well in WandaVision because we had the in-depth look at Wanda's hurt and it turned it from a trope to a character study. It was not done well in MoM.
The whole Darkhold thing was very much story by telling and not story by showing. Sometimes you need the short hand of telling but the Darkhold being key to Wanda's fall needed to be shown, IMO. Look, I get it, Sam Raimi has a thing for evil books. But maybe he could cut back.
@RangerWickett 's outline in post #75 of this thread would have worked for me. Yes, taking time to explain things and build drama would have cut into the SFX time. No big loss.
I would like to suggest that the scene where America lets Wanda find out exactly what "her" sons would think of her in the context of their actual mother being murdered and replaced should have been done early in the film. Then the story could have moved on from there. Maybe Wanda and Strange could have shared a journey of self-realisation while trying to patch up holes in the multiverse.
(I'll have to re-watch WandaVision as it seems my memory of it is not tallying with what I've read others say here in the thread.)