So far the mystery aspect has been pretty good but the overall writing of the show is some of the worst I've ever seen. The main characters are seemingly going out of their way to act either intentionally stupid, or like they want the main antagonist to kill them.

The ML gives overwhelmingly credible evidence to the police force who seem to be staffed by brainless idiots and they simply disregard it. No reason behind it they just disregard it, and because of that people die. Not for any particular rhyme or reason but just because...

Not only that the FL supposedly witnesses a murder and just doesn't remember it? and then a bunch of other witnesses that also saw the same murder just start coming out of the woodwork and dying?

It's intentionally lazy writing.