I grew up watching Star Trek: The Next Generation, which was a great show when it wasn't terrible. And one of the ways it was great but secretly also terrible was what it did to the Klingons. In the original series they were defined as brutal, domineering bad guys, but TNG redefined them as being honor-bound warriors, mixing in Viking sagas, samurai, Tolkien's dwarves, and various other, less fortunate stereotypes. This made for good TV, and helped make Worf one of the show's best characters.
But while "Viking saga on a spaceship" is a really cool idea, it doesn't make any sense if you think about it for five seconds. At what point, in their strict regime of carousing, conquering, and stabbing each other in the back, do they study astrophysics? Build engines capable of warping the fabric of space-time? Figure out how to overcome the Heisenberg uncertainty principle? How does a culture that collectively gets up every morning and thinks "Today I'm going to get drunk and hit people with an axe" become a political force spanning star systems?
Worse, the character of Worf became iconic and much-imitated. What was enjoyable the first time around became tedious very quickly. It had become acceptable, even taken for granted, that sci-fi would feature these noble savages with rayguns. Then, of course, Tolkien came back in a big way, and Hairy Muscle Guys Chopping Each Other to Bits became whole genre of film.
It's worth noting that whether this warrior race is seen as good or bad, they are always a simple stereotype assigned to something other. Dwarves in fantasy, dark-skinned aliens in sci-fi. In the real world, such stereotypes always miss the point of the culture in question. The Vikings, the samurai, various tribes of Africans or Native Americans... They were all complex human beings trying to cope with the world they lived in. The stereotypes come from believing whatever propaganda got spread around, lionizing or demonizing the people in question, but always dumbing down, simplifying, ignoring reality.
Parenthetically, I bet the Black Panther movie will not be problematic or embarrassing at all.
Finally, from a writer's point of view, you can't do much with that character type. Only the denial of reality keeps it fun. If you take him(or rarely, her) seriously, there is no avoiding the conclusion that he is dangerously out of touch with reality. Either a macho idiot with no concept of consequences, or a fanatical reactionary who thinks what was good enough for the noble savages is good enough for us.
