Stick with it. Starts very ordinarily, but gets interesting in the second act.
Wasn't a fan of the artsy-fartsy flourishes, though. Felt like Sean Penn trying too hard to convince people to take him seriously as a director instead of a style that was pertinent to telling this particular story. It wasn't, and it stood out in an annoying way.
Otherwise, solid film with a typically fantastic Jack Nicholson performance and a wonderful supporting cast.