Great film making, but lets face it: this plot and dialogue are weak

Rating: 8/10 (14 February 2013)

Psycho is so overpraised as the greatest horror film of all time that it's hard to break the trend, but here goes. One obvious weakness is the utter ridiculousness of Norman's insanity. I mean, come on! He becomes his mother after he kills her? That would be the only case in all of human history I believe. And the psychologist figures the whole thing out after like 10 minutes with him?
The other weaknesses concern the whole film prior to arrival at the Bates Motel. We get a mediocre beginning with Janet Leigh and that guy in the hotel room; I don't find her attractive--sorry. Why is it exactly they were keeping the affair secret? Who knows and who cares.
Then some rich Texan comes in, Hitch's non-actress daughter has the part and says "I declare!" He says "I don't, that's how I get to keep it." Cheap dialogue really. Then Leigh steals the money and drives away, then buys a new car which does nothing, but raise the suspicion of a cop and car dealer? This film would be completely forgettable if not for the great Anthony Perkins, the great film soundtrack, and a great director.
To drive my point home, imagine the film without the soundtrack and cutting out the Anthony Perkins scenes. What have you got left: mediocrity!