I've been distracted...
We saw Valerian and the City of a Thousand Planets [2017] in the theater and I'm not a fan. I am a military veteran and found the Major Valerian character too implausible. I don't expect majors to be that young! The movie lost me with that.
I saw Flash Gordon [1980] in the theater. (Yes, I'm old.) It was OK but I'm not a fan.
I'll also admit that, given a choice, I'd rather watch Flesh Gordon [1974]. 
Other than saying I think it is also OK, I'll not further discuss its sequel.
I concede Blade Runner 2049 [2017] has a lot going on in it. Personally, I find it helps to watch it shortly after watching Blade Runner [1982].
Incidentally, I think it is also a good idea to watch Blade Runner [1982] shortly before watching Red Dwarf Season 9 [2009].
And I think 50's Science Fiction movies is almost its own genre. Some very good; some very bad.
I confess I like the good ones and many of the bad ones, as well.
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When diagnosed I bought champagne!
I finally knew why people were strange.