I have to agree. Of course, I really only enjoyed the first as a sort of SF. A dear friend once described the series as "a stone age soap opera" and I can't say I disagree.
With that said, I'm about to commit sacrilege, and skewer a few sacred cows. The books that I enjoyed the least often include books that are considered quite good by everybody else.....
"Gone with the Wind" (Scarlett O'Hara desperately needed a good spanking)
"Grapes of Wrath" (read it, and then excuse yourself for a quick slash at your wrists)
"Four Lords of the Diamond" by Jack Chalker: Look, I'm not a feminist, by any stretch of the imagination, but I was STILL massively offended by his "girls as sex toys" attitude.
90% of Anne McCaffrey's work; the dragons were cute the first couple times, and after that, I wanted to puke.
Selected works by Heinlein (I'm thinking, "Time Enough for Love," "Farnham's Freehold" etc.) Again, you have to be very VERY sexist to get me riled, but these pushed me over the limit.