This was inspired by the current thread about The Book Thief.
I've noticed that some books - The Book Thief, A Thousand Splendid Suns, The Time Traveller's Wife, We Need To Talk About Kevin, to pick just four - are on so many book groups' lists they seem to all intents and purposes to be compulsory. Yet they often turn out to be disappointing or even mediocre. So how do these books attain the status of book group mainstays? And can anyone suggest something better?