The impression I get of the books from the writeups (which...uhm...scare me...so I can make no statements of quality myself...) is that there's something about them that rips into the 60s-80s S&S style fantasy with the guy with the harem and other and other old tropes while...erm...revelling in them, which, if you're familiar with where it's coming from, acquires a "so bad it's good" feel. It's like how a lot of romance readers devour the Darh Hunters and Black Dagger Brotherhood books, and some of us read them for the extreme cheesiness of the genre, and (in the BDB books) the times it tears the stereotypes into shreds.

and...err...I have no idea if all that made sense, so I'll just say "I think it may be a personal context thing."