Sometimes even a poor movie adaptation can get me interested in the source material. I liked the concept of an everyman secret agent who is not as refined as Bond, who learns of secret agencies and Eastern martial arts, and approaches it with a flippant American attitude. But does even that concept miss the point of the books?
What part of the novel set did you read, from the very beginning or somewhere in the middle? I assume you would recommend if you read 20+ of them. It seems like Murphy and Sapir never ended the series as they handed it off to be continued by other writers. According to Wikipedia, the last novel came out in Sept. 2019. I wonder if Murphy/Sapir ever penned a "final adventure" for Remo.
Marvel Comics did a couple of runs of Remo & Chiun comics. Did you read those? I wonder if they're any good.
It has been such a long since I read them and it was the first 20 or so can not say really what to recommend after that run. I was a kid and that type of pulp was something new to me. The martial art part was the hook. It wasn't until I reread them later on that they did not not have any merit on that basis. Remo became Doc. Savage without brains or backup team. What he did have was a way higher body bag count and little desire to reign it in. Of course Chiun would have killed him for not following orders. There were some memorable characters like Mr. Gordons and Nuich the dishonored pupil and nephew Nuihc that used his masters name spelled backwards. I would say start with the first three decide if you want to continue and then read some of the reviews staying away from those with heavy spoilers so to enjoy the fun of a first reading. You have to realize they are definitely from and about the times. Not overtly but a glimpse into the era. Also there were other writers involved over the years that I haven't read though some of the people who continued following and felt they were some of the best. I have only read some of the magazines from Marvel but they lacked the right feel to me.