This is without a doubt the single worst "remake" movie ever, and in fact one of the worst films I've ever seen, period.
Van Sant took everything that was great about the original and bastardized it. Billed as a "shot for shot remake" Gus amateurishly apes the Hitchock film, poorly imitating the original. But that not being bad enough, he also occasionally adds scenes that weren't in the original film - like Norman Bates masturbating while looking through the peep hole at Marion undressing, complete with gratuitous sounds to fully illustrate his not-so subtle action.
This is a ham-fisted clumsy attempt to parrot a much more talented director's work. It isn't art, it isn't clever - it is plagiarism and badly done at that. It adds nothing to the original except color and tacky scenes, and that certainly ain't an improvement.