I am going to tell about half girlfriend book.Lack of originality
Well, I am pretty sure Chetan Bhagat writes these days stories with a perspective that it will be adapted into a masala movie sooner or later. And Half Girlfriend is no exception.
The filmy storyline, the slow predictable ending, the same old friends turn into couple relationship(which has been repeated in most of the CB books) etc etc. Having finished the book within a day, I felt like it was a day wasted. Nonetheless people looking for die hard romantic books can try this one.