As I said before, it is a solid series. Up there with George R.R. Martin & Steven Erikson's Malazan (or so I hear, it's in my stack). But no so high that it should incite derision in other series/authors as it seems to in you. The spying/plotting/intriguing in the first book is about as quality as what was in Jim Butcher's Codex Alera series.
I can't really say anything about the Crusades stuff, not my area.
I don't like Kellhus much. Though he (so far) looks to be doing the right goals that need to be done, the eradication of the Consult, the man is so utterly heartless. Yes at the end of book two he pulls off a magnificent bastard xanatos gambit that would impress even Lelouch and Light, but he uses people up and tosses them away. There's that group of 40 people he left Atrithau with. And there's the Dûnyain room of faces, every bit as wrong as everything Consult being a rape machine. Yes it's nice to read non-black/white morality, but everyone here is just assholes. With George R.R. Martin, when shit happens to his characters you cheer or fffffff, but with these people it's all =|
The closest you get to a decent human being is Achamian (and Xinemus). And yes, he is badass when he busts out Gnosis in book two and three. The wathi doll is an awesome little bastard, and got the best scenes imo.
As for the philosophical bits, it didn't really trigger a wow response, but that's because I've already covered much of that ground on my own. But it is something put together well enough that it should be handed to the average person to try and get them thinking.
Another thing that bugs me is, Bakker shows Kellhus working people over bit by bit, but Cnaiür has a single conversation with Conphas and Achamian, and it's all "vwoop, I geiv yuo brain vaccine!" Also, that encounter with the nonman at the very beginning of book one. It vows to hunt him down, and then what. Just disappears for three books. If he doesn't show up in The Judging Eye, I'mma be cross.