Okay, I'll grant that you obviously know your "Dragnet" better than I do. (I confess I only vaguely remember watching it as a kid.) And it may well deserve points for being more realistic, although that's not necessarily the same thing as "smarter."
(Most shows about writers are totally ridiculous when it comes to portraying how publishing actually works, but that's not really the point. It's about how clever or engaging or complicated the characters and stories are, IMHO. Fiction has its own rules, apart from reality.)
But, okay, forget "Dragnet." What's another old cop show that's doesn't necessarily blow today's cop shows away. "MacMillan and Wife?" "McCloud"? "Starsky & Hutch"?
Granted, I haven't seen any of those in ages, but I don't remember them being on a notably higher intellectual plane than, say, BONES or MONK?