I'd give this book somewhere between a 3 and a 4 but probably closer to a 3. 
 Overall I thought the plot was pretty good, and the main characters actions and thoughts were believable and relatable. 
 I could see where the end was going, and I thought the "twist" was fairly obvious, especially in the wake of other books in the genre. 
 Enough loose ends were tied up satisfactorily, especially the romance, but I wouldn't recommend reading this as a stand alone. 
 Where I struggle with this series is the whole concept that people only have aptitude for one faction. To me, to be Divergent is to be normal, and my head won't quite accept the premise of the five faction society. 
 I will go on to read the final book in the trilogy.