Oh, dear. Blade Runner.
Well, first off, the city looks amazing. Visually, Blade Runner is one of those vanguard films that executes its design so well that it becomes hard to separate its visual trademarks from both its imitators and its inspirations. It openly cribbed from Metropolis and old noir films, but it did it so damn well that many of its designs have since become de rigeur. These days, if you want to design a dystopic, cyberpunk flavored setting, than you must contend with the visual standards and conventions that were laid down by Akira and Blade Runner. The essence of that design has become a visual shorthand for a whole genre.
That said, if you consider near universal appeal to be a quality required of a truly great movie, than Blade Runner falls a bit short. For one thing, its often hard to really become invested in noir inspired characters due to their ambiguity and I would say Blade Runner gets hit by this hard. The situation and themes are more interesting than any individual character. We only know them in their desperation; it is all too easy to hold the everyone at arm's length and remain detached from what goes on in the film. It's still a good film, I would say even a great one, since that ambiguity and the nature of humanity are central themes of the film, but I do see why people would be disappointed in it, particularly given that these days many people are prone to evangelizing for it. Blame the legendarily awful first release for that one; it's a film that deserved a second look and sometimes fans get a li'l overzealous making sure everyone gives it a fair shake.