Some people mention too slow for them. This film is a modern tone poem (complete with appropriate sound track) about deep love and deep loss. It clocks in at only an hour and a half, and I've thought long and hard about it: I call the pacing methodical, not slow. There's an awful lot of information being conveyed here, and virtually none of it is blatant.
At one point, I thought the secondary characters could have used a little development. In retrospect, the answer is no. We actually were given everything we need to know about the deep loss of the father, and about the deep grief of the son in respect of the unnecessary loss of both his mother, and his father.
How that all plays into the empathy of the twice grief-stricken Robin (Nicolas Cage) is just brilliant. This might be the pinnacle of Cage's career.
This is the kind of cinema that I love, ranking right up there with the best the world has to offer, and I'm so surprised to see it coming out of the USA.