OK, if you like all these authors I think it's worth trying the Gor series.
As other have mentioned, the first books are pulpy sword and planet fantasies with a SF component. They are not great literature by any means, but they are readable and I found them entertaining as a teenager. Somewhere along the way (perhaps book 6 is as good a place as any to mark the change), the S&M thing got out of hand and the writing became ridiculous, with the characters endlessly pontificating about how women secretly crave being slaves and having a strong domineering master. I mean, I have no objection to those fantasies if that's your thing, but it's a matter of style, not of content. You'll groan each time a character talks and you get another of those lectures. Please, have some mercy on us! I also found it surprising that the author is a professor. He should have seen the flaws in his writing. And didn't he have an editor, or advance copies readers? There are still pulpy adventures in those books, mind you, but the silly lectures disrupt the flow of the story and are really a bother.
Now, someone who likes both the sword and planet component and the S&M component will certainly be bothered by the dialogues, but will probably still enjoy the latter books (I think I read till the 12th or so, so I don't know about the ones after that). A couple of them are told from the point of view of a female slave instead of the main character of the series (for example, Slave Girl of Gor), and those are by far the most dedicated to the S&M theme, with only a flimsy plot excuse connecting them to the overall story arc. They could almost be described as softcore pornography, rather than sword and planet (softcore because Norman never gets into graphic descriptions of sexual acts, he just states they happen).
My advice would be to read the first book, if you are interested in sword and planet stories. It's quite readable. If you enjoy it go on till you get tired of the series.