I thought it was a pretty good flick, with the best part of the film being that it was fully realistic. Robin Williams did a good job, and while he wasn't his usual comedic self, his overall personality was still there in a way that fit. It was definitely easy to relate to his character as well..
I think one problem though is the way they had him discover the affair, the girl's picture is reasonable but I think it was too much of a stretch to make her part in the picture so tiny to the point of needing a magnifying glass. Her presence in the picture should've been a little more spotlighted, like maybe her in a picture with the guy and the woman. (Don't remember their names, heh)