Tigana explored some cool ideas and developed conflicts that made for an interesting story. However, the story always pulled away from those conflicts before they could fully establish serious tension or fully develop characters. I constantly felt as though a great setup was being put in place, but then the drama never got a chance to unfold in action commensurate to expectations put in place by that setup. In most cases the characters were all much too reasonable and logical, never playing out the brutal consequences of their ethnic and familial loyalties.
I do sometimes enjoy a "just for fun" read in which conflicts aren't too serious and are easily resolved. But when a story sets up deep-seated, heart-rending conflict, then resolves them too easily, I'm left feeling a little disappointed.