I know Columbo was played by other actors before but the early takes on the character just weren't as good.
But that doesn't mean nobody else should ever try. For every Jeremy Brett or Benedict Cumberbatch, there have been a bunch of forgettable or ill-conceived casting choices for Sherlock Holmes (Roger Moore? Matt Frewer??). We had to get through the mediocre ones to get to the great ones, as is true of anything. But if people had just given up trying, we wouldn't have gotten those later great ones.
The quirky detective trope is rather well entrenched on TV. Most of those shows don't do gunfights and car chases.
Good point. There was a lot of Columbo in Vincent D'Onofrio's Bobby Goren on
Law & Order: Criminal Intent.
What makes 70s detective shows different from current ones is that starting with CSI there's been a focus on forensics. Colombo just mindf***ed the killers into revealing themselves, and that's far more compelling.
Well, strictly speaking, the first forensic-scientist detective in fiction was Sherlock Holmes himself. He pioneered the field, not only in fiction but in real life, since the stories popularized detection techniques that real police departments would later adopt, often inspired by the Holmes stories. All modern forensic police work is following Holmes's lead, essentially. (Which is why it can be tricky to make Holmes work in a modern setting where every police department already uses his methods.
Sherlock and
Elementary have to focus more on his exceptional observation skills and leaps of insight in order to justify why he's needed as a police consultant, since his scientific and analytical techniques
per se are routine now.)
Quincy, M.E. was also a
CSI forerunner, in that its detective was a medical examiner and investigated based on his autopsy results and lab work. (Well, at least until he gave up hunting murderers in favor of social activism. I always loved listening to Jack Klugman give a speech, but man, did that show get preachy.) I suppose the same might go for other doctor-detectives like Dick Van Dyke in
Diagnosis: Murder, but I don't think the medical/scientific side was stressed that much in that show.
And though it's not really a mystery show, there's a surprising amount of forensic science in
Batman '66. I realized a while back that Batman and Robin in that show were basically the Gotham City PD's unpaid CSI division, always taking clues back to the Batcave to run lab tests on them with Commissioner Gordon's blessing.