I was amazed and impressed by how restrained the sentiment was
Just reading the synopsis for this movie had me expecting a bit of a syrupy festival of sentiment or a tear-jerker, but I was very impressed with how matter of fact the content was presented, beginning with the opening shot.
I've seen someone on this board say its comparable to 'it's a wonderful life' with a carpe diem theme. I felt exactly opposite. Watanabe, in his struggles, finds out that niether his job or family (greedy son) gave his life any meaning or fulfillment, realized completely when he tries to tell his son about hsi illness but is incredibly cut off and chastized.
Holding back on teh sentiment made the final flashback of Watanabe all the more powerful, I thought, one of the only glimpses we get of him as happy or satisfied.