Agreed that this is another decent film with Williams in and one in which he's one of life's victims who goes over the edge. One Hour Photo does however have the virtue of shying away from total repetition in, as James points, having Sy not take pix of the couple but his hotel bathroom - his redemptive cathartic/seperation act that he finally clings to.
I saw Ross's review of this and it further (if ever needed) nailed what an idiot that bloke is with his contrived accounts. Of particular note, Ross droned on about how perfect the family was and had the viewer wishing ill-will. However, anyone with a nats intelligence could see that all wasn't quite so peechy with a controlling husband and yet stifled husband that arched over the family's happiness. What I did find difficult to get past, for a while at least, was Gary Cole as Williams' boss after seeing him in Clerks. And the unusaul, in a way, choice of Dr Benton from E.R. as the detective. Though aside from the repeating victim cycle, the worst foible of the story was Sy's stupid mistake of not paying and/or failing to cover for his photos. Sy was depicted as an anal-retentive but made such a crass and obvious error in a job which he was 'perfect' at and one which has losses that could be easily hid. Although the shrink/cop out there would no doubt tell you it was intentional by Sy who wanted to be caught.
Whatever. All told it's a fine film with an even handed performance by Williams who runs with the character with accomplished grace.