From is underrated? I didn't know that, been watching it religiously.

An older favorite of mine was The 4400 (the reboot is absolute dogshit though). Unfortunately they cancelled it after 4 seasons, but the original authors published 2 books afterwards to finish the storyline.

Other series I enjoy that aren't on most people's radar (primarily for being British, mostly crime):

1. Vigil (crime series dealing with an investigation on board of a nuclear submarine, 2 seasons, closed storyline).
2. Unforgotten (crime, every season starts with an old body being discovered and then showing all people affected by the loss of said person over time until they eventually get closure. Highly empathic actors and excellent character development, season 6 currently being filmed).
3. Death in Paradise (iconic light entertainment crime series playing on a remote Caribbean island where changing inspectors from England with various degrees of clumsiness are being sent to solve murders. Every episode is usually a closed case. Season 14 to start end of year).