I watched this movie for the first time yesterday with my mum. Although it was entertaining enough and technically not a bad movie, it was extremely depressing. Both my mum and I were genuinely upset by the end of the film. One good thing though, because we bought it on DVD, we watched the commentary with some of the cast and crew. Although we know it was only a movie with actors, it was nice to see them out of character, discussing their roles and just being lighthearted. This was good for a movie like this because its main character was very lonely, and someone the viewer would most likely feel very sorry for, so it was great to see the actors talking and having a bit of a laugh in the commentary.
Long story short - I would NOT recommend this movie due to its depressing nature (my mum and I watch a LOT of movies, and this is the first time we felt this upset by the end of a movie), but of course, this is just our opinion.