I agree. It's great tv. I got addicted and have now binged it from multiple countries. They are a all a bit different which keeps it fresh.
The concept works well as you see the stress the traitors are under as the series progresses. They are under stress that they may be caught, but also feeling guilt over their actions and how it doesn't align with their personal relationships, or how they use their personal relationships to manipulate.
I think, in part, the reason it works so well is that you are going to be caught or accused of traitor behaviour if you are too aggressive or too passive, sonit encourages people to take action but cautiously, which is a fine line to thread.