I am the kind of person who enjoys “big weird” scifi like Stanisław Lem. Stories about trying to relate to and find common ground with something so alien that the prospect of even understanding is basically hopeless. Star Trek usually doesn’t do stories that, which makes sense as it often uses alien races as allegories or stand-ins for real-world human relations.
That said- I thought those early Klingons were super weird and scary because they were just so alien. It really made sense thinking about how it took a century before they could get to the events of Star Trek VI, and it made the Khittomer accords feel like so much more of an accomplishment. Like- you made a treaty with WHAT?
And just aesthetically their ships and armor looked like something out of HP Lovecraft or HR Geiger:
This is not to say I dislike how Klingons were portrayed previously, kinda like Mongols in TOS or Vikings in DS9, just that they never felt scary to me. They never felt like warriors. I was never afraid for the gallant crew of the Enterprise D (a science and exploration vessel) going into battle against Klingons. But I really enjoyed the alien-ness Disco tried to go with. Anyone else with me?
EDIT: PEOPLE I SAID WHO’S WITH ME NOT WHO ISN’T CM’ON
I thought it was all a bit confusing - it was introduced with no explanation, which felt like it was setting up some big reveal that never came.
I like the, as you say, Giger-esque design but felt it was such a departure that they may as well have introduced a new species.
I’ll never understand why it’s treated by some people as some ridiculous expectation that things that couldn’t change so drastically over the course of 5-10 years (the entire biology of a species, for example) shouldn’t do so, and that we’re the odd ones for saying “but wait how is this supposed to take place in the same timeline?”
I just think it points to a failure of imagination more than anything else.
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…That’s literally what happens in the Dune books.