As a fan of killer-croc horror films, the opening scene had me hooked, and the rest didn't disappoint. I'm not sure what show some of these reviewers watched - the acting was good all-round, the story was exciting and well-developed, and despite a lot of the elements not being entirely original, the setting and atmosphere helped set it apart from your typical mystery/thriller show.
Thomas Jane was good as always, though maybe a bit similar to his character in The Expanse. I hadn't seen the lead actress in anything before, but she was more sympathetic than I was expecting her to be, and her being "clichéd" as a tough ex-con is kind of the point - the character herself is playing a role.
I would have given this an 8/10, but it's way better than a lot of the reviews make out, and deserves more than the current average score. Maybe an international audience will be more appreciative.