I've given it 7 because of the scenery, otherwise it's a 6.
The first series started of like it was going to rival some of the other thriller TV series like Ozark, but quickly proved not. A different concept: yes. Set in Canada - for a pleasant change - amidst fabulous scenery, the implausible, alchoholic, head-banging ex British cop is ridiculous.
I managed to stay with it till the end, and when the 2nd series came out I thought " this has got to be better", but it wasn't. However, I must have had nothing else to watch at the time, therefore I watched the whole over-the-top craziness again.
Now, the 3rd series is being shown on Now TV (from Sky), and I have struggled through the first 3 episodes before giving up entirely. The production values are high, but the storyline could have been written by the Brothers Grimm, it's that unbelievable. The whole thing has grown exponentially madder and preposterous.
The sooner Line of Duty, Better call Saul and Ozark come back the better.