Jericho: A post apocalyptic show that isn't just mohawk bejeweled raiders roaming around. It is a show very much of the GWB era, with offbrand Blackwater as major villains and heavy Dick Cheney vibes when it comes to the larger plot.
Kings: A sort of retelling of David versus Goliath except set in the modern day. If you liked the weird esoteric spiritual stuff on the Battlestar Galactica reboot, you'll like this.
The Unit: A fictionalized adaptation of Delta Force missions, with at least early on heavy influence by the former Delta author of Inside Delta Force. Great early seasons. Later seasons become more Hollywood nonsense, you tolerance may vary, but season 1 and 2 have some gold.
The Wire: This was a huge show when it was on, but maybe zoomers don't know about it. This is the crime show for people who hate everything about modern "procedural" crime shows. It is nuanced, thoughtful, and engaging.
Columbo: Speaking of crime shows and procedurals, Columbo is both and neither. Columbo is entertaining and keeps you invested with its unique approach to murder mysteries. It really doesn't pretend to be a proper procedural, and you're best off thinking of Detective Columbo as a supernatural embodiment of karma and guilt rather than an actual member of a police force.