Well, I finished this series. 
 Book three was definitely my favorite, but the ending wasn't fairly satisfying (books 4 & 5 didn't work for me), though I wish there had been fewer narrative cheats, which seemed to escalate in the final installment and less artificial conflict, re: Adrian drama (I never bought Adrian as a serious love interest for Rose, since the endgame in this series was obvious from the get-go). 
 I really do understand the love for Rose, and as a character she transcends a lot of the terrible writing which permeates all six of the books in this series. 
 I'll write a longer review of the series on CEFS, I think...