The well-known British critic Barry Norman would probably agree with you. It's the one in Sight and Sound's top 10 he considers most overrated. Of course Hitch changed the original story to do away with the element of surprise, altered the type of suspense to allow concentration on other themes and ideas; gender, identity, manipulation, mental turmoil, sexuality, obsession, mirrors, duality. Though i prefer North by Northwest, i love the richness of Vertigo's mystery (brilliant use of filter, as well as technical tricks), and have taken into account a little its current phenomenal ranking. It makes for a very interesting comparison with his most underrated film Marnie.