As it turned out, the characters in Book Club agreed near the end of reading the trilogy that it wasn’t very good even though it did bring changes in each of their lives. (The emotionally unavailable hotel owner opened herself up to being vulnerable. The judge started online dating, the recent widow found her voice and the married couple made their way back to each other.) Although one of the characters said a line about trilogy that rubbed me the wrong way: "It's just a love story that proves even a guy who is fifty shades of fucked up needs love.” If they had left that one line out of the movie my feminist sensibilities would have been happier. It's a dog-whistle to abused women who suckle at the tit of ‘Fifty Shades’ suggesting they should keep loving their abuser instead of leaving.
The bottom line from my point of view is you don’t have to like the infamous Fifty Shades of Grey books and movies to enjoy a light comedy like Book Club. I sure did. And it definitely wasn't "cosplay"---I finally figured out what the word means. No one dressed up in S&M garb or bought handcuffs or set up a red room with torture devices like Mr. Grey's. The characters were relatable and believable and I loved the way Candice Bergen delivered her nuanced humor. She was my favorite character. If you saw the movie who was your favorite? ©
If you want to read a funny (but long) tongue-in-cheek movie review of the last of the 'Fifty Shades' trilogy movies, I highly recommend one from The Atlantic. Fifty Shades Freed: a Spoilereview