Most of the reviews which were critical must come from the Hollywood elite.
Although parts of the movie are a bit far fetched a great deal of it is accurate when it comes to loss of a child and the strain it can put in a marriage. Also it accurately portrayed that everyone grieves, copes, and eventually moves on in their own way and time.
Some of the reviews point out that the two main actors are better off doing comedy. I disagree and felt it was refreshing to see them both in well acted serious roles.
And last the musical score is beautiful and fits well with the theme.