Once again, with a few exceptions (mostly his early British films) I find his stuff bloated and superficial. All gloss, no depth at all. Character development is shallow, and often the acting is below par (only partially the directors fault...you can only work with what you have).
His cinematography is tricky for no particualar reason, other than to call attention to himself. Often, the tricky camera angles (e,g, the early POV shots in "Notorious" of Bergaman lying hung over on the bed looking at the Grant character) carry no useful significance, don't tell us anything about the character, don't particularly do much for mood or anything to carry the story forward...they are just self stimulatory and self indulgent.
I, too, liked "Psycho", but mostly for the fact that Hitchcock broke an unstated agreement between film maker and audience, which created an atmosphere of unpredictability...anything could happen. That unspoken rule he broke was the audiance expectation that big name stars always make to to the end of the movie...and he killed off Janet Leigh in the fist half hour. That created a feeling of unpredictablilty in the audience.
Otherwise, I find his stuff full of cheap tricks, ostentatious, but meaningless, directorial tricks, mediocre acting, uninspired casting (his obsession with the "icy blond" was a big pain in the ass) and with a few exceptions, not particularly suspenseful.
Just one man's opinion...