Not heard of any of these novels before - but I would say, giving up on a novel is all part of the reading experience! Perseverence in a bad story isn't really the purpose of reading is it? Afterall, who wants to get lost in a world where we feel unease?

The John Green one was the most interesting to me, 'The Fault in our Stars' was such a widely pushed release - I remember it being EVERYWHERE and I think that it was a film also. By this virtue, I would have thought I'd seen the Alaska book cover or heard of it before, but Googling now and seeing it seven years earlier, it made me wonder if John Green didn't need those seven years to mature his writing style. Just a wondering.