Yup, I'm placing myself on the five-star side of this camp. As for the criticism of how Hazel and Augustus talk, I do know some teens who think and talk this way, and I think facing down one's own mortality can only make you more fearlessly yourself. 
 I liked that the home base of this book was Indianapolis (Midwest settings don't seem that common to me). Also, there was a social network that was Facebook-like, but unnamed. 
 Some favorite quotes (hidden in spoiler tag in case you haven't read it yet): 
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 "Neither novels nor their readers benefit from attempts to divine whether any facts hide inside a story. Such efforts attack the very idea that made-up stories can matter, which is sort of the fundamental assumption of our species." -from the Author's Note 
 "Sometimes, you read a book and it fills you with this weird evangelical zeal, and you become convinced that the shattered world will never be put back together unless and until all living humans read the book. Ad then their are books...which you can't tell people about, books so special and rare and yours that advertising your affection feels like a betrayal." 
 "Pain demands to be felt." 
 "'Always' was a promise! How can you just break the promise?" 
 "Sometimes people don't understand the promises they're making when they make them," I said. 
 Isaac shot me a look. "Right, of course. But you keep the promise anyway. That's what love is. Love is keeping the promise anyway. Don't you believe in true love?" 
 I didn't answer. I didn't have an answer. But I thought that if true love did exist, that was a pretty good definition of it. 
 "That's why I like you. Do you realize how rare it is to come across a hot girl who creates an adjectival version of the word pedophile? You are so busy being you that you have no idea how unprecedented you are." 
 "As he read, I fell in love the way you fall asleep: slowly, and then all at once." 
 "That's what I believe. I believe the universe wants to be noticed. I think the universe is improbably biased toward consciousness, that it rewards intelligence in part because the universe enjoys its elegance being observed. And who am I, living in the middle of history, to tell the universe that it -- or my observation of it -- is temporary?" 
 "It seemed like forever ago, like we'd had this brief but still infinite forever. Some infinities are bigger than other infinities." 
 "The pleasure of remembering had been taken from me, because there was no longer anyone to remember with. It felt like losing your co-rememberer meant losing the memory itself, as if the things we'd done were less real and important than they had been hours before." 
 "You should go home," I told him. "Sober up. Write another novel. Do the thing you're good at. Not many people are lucky enough to be so good at something." 
 "I felt that I owed a debt to the universe that only my attention could repay, and also that I owed a debt to everybody who didn't get to be a person anymore and everyone who hadn't gotten to be a person yet." 
 "...it occurred to me that the voracious ambition of humans is never sated by dreams coming true, because there is always the thought that everything might be done better and again." 
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