I think Blade Runner is properly regarded. It’s got a complex and adult script, odd and compelling characters (nobody is really likeable as such but they are interesting). The acting is top drawer throughout and then comes the environment which is astonishing. When it first came out it was under-rated.
I showed it to a friend of mine who had come from a little village in India and hadn’t seen many western movies and he genuinely thought that American cities had flying cars while watching this.
Clearly Scott is a visualist only. The level of visual perfection in Blade Runner is still evident in Prometheus (if you ignore the makeup job on Guy Pierce) but with Alien and Blade Runner there were proper writers and actors that could cope with very limited character direction.
If younger Harrison was in Prometheus he would have probably not allowed his character to as much as a twit as the crew of Prometheus. That’s the difference between an artist and a professional, both can make money but it’s usually an accident when a professional makes art.