Blade Runner is one of those movies that are remembered more for introducing interesting questions and world-building than presenting a truly engaging and highly efficient narrative.
Like Star Wars and Robocop, it is not flawless and hardly a masterpiece. But, like the above, it also has a significant place in the history of film.
Star wars is a masterpiece. You just need to look at the aftermath of what it did to the cultural landscape. By far more influential then blade runner.
Star wars is definitely lower brow entertainment then blade runner but there's no denying the fact that it is far more influential.
I think you're conflating very dissimilar things. Blade Runner and Star Wars are both incredibly influential, but artistic quality and influence are two very different things. The word "masterpiece" is related to artistic quality, not influence. Keeping Up With the Kardashians is highly influential but few people would call it a masterpiece.
Like Star Wars and Robocop, it is not flawless and hardly a masterpiece. But, like the above, it also has a significant place in the history of film.