I bought this book, as well as the immediate sequel, the Song of the Earth, in the hopes of reading some quality fantasy tinged with Celtic elements... There is, however, a difference between being able to write well and being able to write a good book. Let us see.
1st and foremost. Mor doesn't know what to do with his characters. All of them can either be described with a single adjective, or not at all. They are not personalities at all, merely collections of gestures and actions or monolithic representations of a single trait.
2nd. The action is so unimaginably slow. Here is mr. Caiseal Mor describing the end of an era, and all you have so far is a battle or two, a skirmish or two, pregnancies, attempted rape etc etc. The book is out of focus, truly. True, sometimes the scope widens to include scheming and long-term planning, but even that is all laid out for the reader, in a see-all-know-all manner that denies you the biggest thrill of seeing politics in the making: gradual understanding. Discovery.
That leaves us with poor characters riding out a mediocre plot. The two crowns are for the Celtic reference value, and Caiseal Mor's effort. But that doesn't make this a good book...