I'm reviewing the whole of the War of Powers books together, because I read them as one long story (the version I had was two books, parts 1 and 2, rather than six separate books).
This is a guilty pleasure as much as anything. I think I enjoyed Part 1 the most. It began with action and rarely lets up for long, as it mixes sex and adventure, fighting and near-escapes. Even though they are big books you hurtle through it. I loved them when I read them many years ago. Having just re-read them - well, they weren't as good the second time. I was more aware of the cliches and stock characters (grumpy dwarves, avaricious bankers, barbarian women). However, there are still a lot of surprises, and it often goes in ways you wouldn't expect.
Sometimes it's surprising in the things it includes. One example: the ghost of an old nun masturbates a princess companion that she occasionally refers to as her child. Within the fiction of the world it makes sense, because nearly everyone seems to be motivated by sex or lack of it (Rann becomes a torturer because he can't have sex with the women he fancies). One princess starts having sex with bulls when she tires of gangbangs; another has sex with a humanoid creature that has two dicks for double trouble (while her boyfriend sleeps unaware in another room). And when there's an official meeting with an emperor, the emperor's sister wanks him off during the chat. Again, written like that it is nonsense, but within the tally-ho world created here, it almost makes sense.
There are rare slips of continuity, such as when Fost's collar bone is smashed, yet it is immediately forgotten and he is swinging a sword and fighting again, and only moaning about his broken nose. Or when the Ethereals meet Rann - who had tortured and killed a number of them - but it seems to be forgotten by the writers, and no comment is made on the meeting. Still, the story mostly works, and switches well between personal adventure and larger-scale battles.
It's not high-brow fiction, more like well-written pulp. And sometimes that's what you want.