This book as been accused of telegraphing what's going to happen. Well it does, but don't all Grisham's books. The Pelican Brief did much the same and, by all accounts, that came from Grisham's purple period.
The real problem with this book is that it needed a bleak ending. It got one. That's what irritates people about this book. The readers of this book wanted there to be a happy ending, with the good guys skipping off into the daisies together. When that didn't happen (especially given that there was a twist in the end which would have allowed that to happen), I think people have got irritated. I'm not sure I blame them either. I wanted there to be one, but this book is more typical of real life (and the American legal system) because it didn't get one.