For all the "reasons" Gus Van Sant gave for wanting to make a (virtually) shot-for-shot remake of Alfred Hitchcock's seminal movie Psycho, unless his main reason was to show that he was not, and never could be, in Hitchcock's class as a film maker it's safe to say he failed.
Of course he was on a hiding to nothing from the start, although he might have well gotten away with a re-made "homage" which appropriated parts of the original, as the original is one of the most famous movies ever made. He's not helped by disastrous choices in the main casting. Vince Vaughn's Norman Bates is wrong in almost every sense; whereas Anthony Perkins Bates hides his menace (at least at first) Vaughn seems unable to contain at any point the fact that his character is mad and, or an even more basic level, is just too imposing. His slightly "larger", less attractive version of Bates might be more akin to the original novel but as the novel is, frankly, dull and turgid that's hardly an excuse. Anne Heche may be a decent enough actress but she has none of the star power of Janet Leigh and even if, despite the original's ubiquity, you didn't know she was going to be killed off by half-time her death has little of the shock value that was so important to the original.
Filling the lesser roles in the films with "star names" somewhat misses the point as well. Viggo Mortensen is definately a better actor than John Gavin (or "the stiff" as Hitchcock called him) but in this "shot-for-shot" remake he's not afforded the opportunity to make the role his own.
IF Van Sant had made an attempt to do something different this movie might have been something worth watching but as it is it's just a mess and the small differences that Van Sant does make have no positive effect on the movie at all (do we really need such explicit information about what Vaughn's Norman Bates is doing whilst he watches Anne Heche in the shower?). If you're a Hitchcock fan this might have some small interest to you, if only to confirm to you that you were right all along, Hitchcock was a genius, but even if you could detach this movie from the original (which, to be honest, you can't) this would still be a dog of a movie which seemingly manages to totally miss the point about everything that made Psycho such a great movie in the first place.