I'm reading these now. About 3/4 through the house of chains. (book 4?)
The scope is pretty large, and book 1 makes no apology in dumping you into a world with a complex political structure and varied characters who all seem fairly disparate to begin with.
I have found loosing touch with some of the characters introduced in book 1 annoying, only to be rewarded with their reappearance later on as the story progresses through a changing continental power struggle.
Then there's the all of the stuff that happens in the past - the t'lan imass for example, how they came to be; all of these complex threads that seem to have no relation to eachother, and yet I constantly have those 'light bulb' moments when some later plot detail ties into a previous event where a juicy barb, designed to make you think 'wtf that all about, and why u leave me hanging?', is resolved, or at the least allows you a glimpse of something greater yet to be revealed.
There's plenty of humour, well rounded characters and motivations, epic heroism and appalling tragedy. Many of the incidental players serve to flesh out the main characters lives and sometimes evolve into significant players in their own right. The detail of the history of 'supernatural' side of things is vague, but in the same way the bermuda triangle is vague and full of tantalising mysteries, where you only know enough to perpetuate your curiosity.
So far, I love it. Without any spoilers, I was surprised at how some of the characters were killed off; especially if they are likeable and worthy of their storyline. And yet I can see why they had to go. I suppose it's a clue as to the strength of the characterisation that the reader feels empathy for them and sorrow at their demise, almost as though you share the world created with the other characters left behind.
There might not be any greater truth or moral to be espoused by such books, but their ability to draw you in, admittedly with some patience on your part, is as rewarding as it is enjoyable.
If you've ever read the chronicles of thomas covenant, then you have some idea of the scope of time lines that these books seem to encompass.
Amazon will soon have another order from me for the rest of the series.