Oh my god. Everyone said this book was great, I underestimated how great. As I was reading I was wishing it would never end, I could have read that book forever, it was just so beautifully written! I feel so sorry for the next book I read after this one and I'm so glad I read this because I was suffering the beginnings of YA PRN washing machine syndrome. Ya know spin, rinse and repeat? So this was just so wonderful. 
 The mythology was like none of that pathetic excuse for angels crap that have been dragging themselves into being published. Not only was it incredibly well thought out, it wasn't a rip-off--it was just so original and ahmazing. The world was just so terrible and beautiful. The whole war thing not only made an incredible setting, but also made you appreciate the beauty all the more in the world Laini Taylor has created. For example the legend of the moon. 
 Also, the encorporation of different countries to the book gave the book an even more fresh and cultured feel, with a heavy reference to art. It's what I liked about Die for me. I felt like I was sorta on holiday; chilling in Prague and Morocco (which also earnt the author bonus points with me as I'm half moroccan). 
 I was really surprised by the version of angels/demons, and happily surprised. It was just all so new to me! Karou was also soso great. She was completely unstereotypical and she made me want to get a bunch of tattoos and dye my hair blue in fangirly appreciation. I won't though because not only would it not suit me, I'd probably be very lame for doing that too. She was strong, reeeally strong, possibly the definition of ass-kicking because I admired (and hated) her ability to fight for her family even if it means leaving behind the very beautiful boy. 
 I can't actually think of a character who didn't make an impact in the story. Everyone was there for a reason and there were no cardboard excuses for a character. Brimstone was the epitome of mystery and I adore him, I really do. 
 The book was literally just a work of art. Art that can be--and should be appreciated by everyone because it's awesome.