Whatever anyone thinks of Blade Runner (and I'll admit it leaves me a little cold), it's stylistically exceptional, and was highly influential, as a revisionist (or "tech") noir, and on an emerging wave of cyberpunk fiction. We have to give the filmmakers credit in this regard.
I wouldn't dismiss the film thematically, either. I think it engages with a range of highly pertinent and complex themes.
For instance, Blade Runner asks existential questions, some of which feel more urgent since its production -- what is the nature of human existence and consciousness? What distinctions should we make between the biological and technological? What responsibilities do humans have over the things they create? How do these questions relate to or alter our morality? And that's before we get into issues of cultural imperialism, which are just as complex as the questions posed above.
The film doesn't answer these questions, but then neither can I. And it seems unfair to judge the filmmakers for failing to answer questions scientists and philosophers have wrestled with for centuries, or in some cases millennia.
At the same time, I probably find Blade Runner an easier film to admire than enjoy. I'm happy to embrace Blade Runner at a stylistic level, and for the filmmakers' audacity and prescience, even if I feel emotionally detached from the characters. Maybe that's the point... The film can also be read allegorically, in any number of ways.
Oh, and there's more going on with Star Wars fandom than nostalgia!