So, my wife and I watch a lot of procedurals - both Law and Orders, all three FBI's, NCIS, Bull - and while we know they suck (not an episode goes by where we don't either say "wow, that's NOT how it happens", or I predict like 30% of the dialogue) the arcs are interesting and sort of suck us in.
But I have to say, there are flashes of brilliance; I'm a HUGE Mark "Leroy Jethro Gibbs" Harmon fan, and was sort of bummed when I heard he was not going to be in the full season this year, but Gary Cole has done a magnificent job of both keeping it interesting but not being a Gibbs clone. NCIS is a great example of how a show can turn over EVERY major character (except maybe McGee) and yet still survive/thrive.