Well, not exactly. The world is full of highly regarded films that bombed on release, and vice-versa, huge hits that are awful, forgettable films (Dirty Dancing comes to mind). (In the case of Blade Runner, you have the peculiar example of a production executive who hurt the film prior to release, and a different edit today that’s much more highly regarded because it undid the damage.)
I never meant to imply that a film’s financial success is a measure of its quality. Airport, for instance, was a big hit, but largely forgotten today. But Chinatown, though it did well, wasn’t nearly as successful. The test of time is a much better indicator than box office or even contemporary critical reception.
However, financial success is a reliable measure of popularity and a quantifiable indicator of what audiences really want—and much more reliable than aggregating online opinions. Even if there are no bots and no shills, there’s still the matter of self-selection bias—rendering the RT audience score, at best, unscientific.
Of course, the hard part about collecting real data is interpreting it. History is also full of sequels to big hits that themselves flop. Speed 2, Ghostbusters 2016, Basic Instinct 2, et al.