Sooooo predictable (spoilers)

Did anybody else find this ridiculously easy to predict?

I knew she was in on it when they were in the car and only she, not the husband "speaks" to the daughter and we as the audience don't hear Sophie’s voice on the other end. Although I didn’t see the motive coming until she mentions Denver and we see his reaction to it. He had clearly been unfaithful at least once before and she was still bitter so it didn't take a giant leap in logic.

BTW I'm not writing this because I think I'm super smart or anything. I have watched loads of twist ending movies and I rarely see it coming, even when it's really obvious.

I can’t be the only one disappointed by the not so big reveal.