Michael Caine had a great quote about making movies. I'm mostly paraphrasing it but he said, "Sometimes you make a movie because the story speaks to you. Sometimes it's because you admire the Director or the other actors. And sometimes you make one because you want another beach house."
I would put Jaws 4 in that last category.
PS - thought John Wick 2 was good, not great. Not nearly as good as John Wick. But am looking forward to third installment.