Not bad, but not good either. The pace is slow the whole way through, never really picking up. There's no suspense, because the movie tells you early on who the killer is, and there's no twist or confusion, it's exactly who you think it is. It more or less gives away the ending before it happens. It's not a suspense, horror, or thriller, but I'm not sure how you would categorize it. Most of the plot is somewhere between unrealistic and unbelievable. The ending is unrealistic and unbelievable for a few reasons, making the ending entirely unsatisfying.
This movie is confusing for many reasons. For starters it's apparently based on BTK, but takes so much liberty in the storyline and plot that it confuses and upsetts people who expect the plot to follow that of BTK. Secondly, its hard to place this movie into a genre. Others have reviewed the movie as a suspense/thriller, but I do not think this movie was suspenseful at all. I love suspense movies, but there was no twist, the pace was slow, really only one action scene, all culminating in the delivery of a predictable ending, but in a way that is unbelievable and unsatisfying.
At least when you see a bad movie you can be upset about it and sometimes laugh at how bad it was. This in a way is worse because it's not really a bad film, it's just not a good one. I wouldn't watch it again or recommend it, but idk that I would tell someone not to waste their time watching it. It is memorable in that you'll probably remember how average or upsetting it was, but not memorable own it's own. Its just okay, a big meh of a film. It had the chance to be good and just decided not to be.