I know I'm probably in the minority with this but I actually liked the ending. I completely understand why so many people didn't like the ending (view spoiler)[ or rather the non-ending (hide spoiler)] but it was different and I appreciate the fact that Oliver didn't wrap everything up and slap a shiny bow on it. (view spoiler)[I do wish that there would have been some resolutions on some things and I definitely want to know if the bomb went off but I can accept the unknown. (hide spoiler)] 
 I didn't like how the love triangle played out. I found Lena to be annoying and not likeable, but I really enjoyed Hana's chapters. 
 Initially getting a 4 star rating, but that may go down to 3 after I write my full review. Many things left to ponder.