I've been working my way through the Nora Roberts canon and, as with anything, have found it hit or miss, with more misses from her earlier works. So this came as a pleasant surprise. Whereas the first in the trilogy felt a bit too caricaturish to me, I found Brianna and Gray to be much more developed and layered characters than Maggie and Rogan. Brianna in particular, as she was so much more than hinted at in the earlier book. (I also, for that matter, liked Maggie better in this one. It was nice to see her through Brianna's eyes.)
So, yes, the ending was entirely predictable -- I mean that coming from someone who has come to know the formula of romances down to the specific chapters in which to expect the various plot points. But even though the parallels in Gray's book and his own feelings were so utterly obvious, I honestly didn't care. Once again, there were actual tears when [SPOILER ALERT]...
... he comes back for her in the end.
P.S. And extra points for the Carstairs.