The show is somewhere between 6 and 6.5 at best.

Casting should have been done better, for example Kathleen role is total miss with actress, she should not play that role not even in her dreams. Others are ok or below average.

Anyway, the show is watchable if you do not have anything better to do or watch. The pace of action is quite slow and easy predictable, you are constantly waiting to something start happening to justify time invested in watching it but unfortunately it doesn't.

I am not sure why it has 8.9 rating at time of writing this comment, since similar shows are much better, for example The Walking Dead first couple of seasons are way better written and executed.