What's your opinion on Room by Emma Donoghue?

A 5-year-old Jack narrates life inside Room: his whole world but his mother's prison. Reviews seem to be split on this one. It was a NYT Nestseller and won the Best Book Of The Year award. It seems people either loved it or hated it (couldn't connect). What's your take? Do you think the use of a child narrator worked for this book or did you find it tiresome and annoying?

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