In many ways its very much your standard bloated, overlong, overly complicated epic fantasy where the author has a cool world but fails to place within that world a suite of well written characters or an effective narrative. I honestly got bored and stopped a book or two from the end, and just read the wiki to satisfy my desire for knowledge about the world, because that's all I ended up caring about.
I'd honestly really enjoy reading about it as a campaign setting splat book or false history, but how it's written it fails to be a good series of novels. It does have awesome world building, but in my opinion it falls into the trap of trying to rest everything on the world. It rarely gets in the way, which seems to be what the author intended. The prose is about average for fantasy, but far inferior to any of the greats (Le Guin, Mieville or Harrison) or even the goods (Martin, etc). They seem to be used less as characters with agency and more as avenues to explore the world.
There are a couple of actually fleshed out characters, but most are either stereotypes or very shallow. It also goes off on massive tangents that, while connected to the main plot, could be literally erased without losing anything of value.
The narrative is disjointed, bloated and suffers from the "I'm going to pile mysteries on you for 9 books so I can have an epic conclusion" syndrome. It's very much a work where it's evident the author is as much concerned about showing off his Totally Awesome and Unique campaign setting as he is concerned about writing a series with a tight narrative, good prose and solid characterization. Not a big fan of it myself, I think it's way overhyped.