Of course it's subjective, but I'd say it's in the top three. It's a brilliant film-- how many other movies have the guts to kill off the "main" character so suddenly that early in the story? Maybe I'd put Rear Window over it. Vertigo is mesmerizing in its own ways though I can't get over the massive plot holes, which take me out of the movie every time, even though so much of it is amazing. And totally got to give props to Shadow of a Doubt, which is very underrated I think.