I don't get it, why so much praise?

Rating: 3/10 (8 April 2020)

I watched it and it was a very generic detective movie, nothing more. The ending is predictable, when Spacey said "I have a surprise for you detective" I instantly knew he killed his wife, because what kind of surprise a serial killer can give? Nothing in this movie is more than average. I don't get the praise at all, I guess it's about ending, but I think it sucked.