+1
The only thing I've disliked about the show is that they always reveal the killer in the first 10 minutes, which I guess was normal for these kinds of TV shows.
No, exactly the opposite. It completely subverted the whodunit formula. Instead of having multiple guest stars and the viewer trying to guess along with the detective which one was the culprit we watch the crime committed and usually get the motive. The fun of the show is watching the cat and mouse between Columbo and the criminal who usually believes they have committed the perfect crime and therefore are cocky and/or underestimate the frumpy, quirky policeman who manages to ferret out the truth or find the one small mistake in the otherwise clever scheme.
But as others have said the show's formula, though different, was not the selling point. The attraction of the show is Falk's performance and the gallery of stars they got to be his overly confident foes.
I have always liked
"Columbo" for those reasons. My all-time favorite is
"The Rockford Files". That series had some clever writing and mysteries from time to time, but again the overwhelming strength of the show was not whodunit or a reliance on suspense it was that Garner's character was so incredibly appealing and his first instinct was self preservation and not heroics. That show had an equally appealing set of supporting characters as well (Rocky, Dennis Becker, Angel Martin, etc.). Watching them interact with each other was the hook, not who had the diamonds or why somebody was trying to kill this week's client or whatever.
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"Film is a disease. When it infects your bloodstream it takes over as the number one hormone. It bosses the enzymes, directs the pineal gland, plays Iago to your psyche. As with heroin, the antidote to Film is more Film." - Frank Capra