Honest question, have you?
Memento is a well done twist. The character from the get go is established as unreliable, and it is obvious to the viewer that they are seeing events out of order. When things go down, you as a viewer don’t feel cheated.
Inception doesn’t really have a twist that I recall, it does however establish the question of reality and if you can trust what you are seeing and leaves it open ended.
Also, I’d point to Fight Club and The Sixth Sense as being well executed and fair.
Bernard in Westworld is fair, the Timeline theory would not be for several reasons already discussed. The introduction to William, the framing of scenes such as when Dolores met him or when the the sheriff grabbed her and William said she was with him, etc. These would all be cheap tactics of the showrunners and I would find it very disappointing.
Have I seen Memento, seriously…