Yes, I'm bashing on Captain Picard.
You're a madman, Kelley! You'll kill us all!
Yes, very likely, but that's not the subject of this post. My complaint about Star Trek is that their characters are too perfect in a military sense. Starfleet doesn't make any mediocre captains. The institution is a complete meritocracy. Anyone in command has fully and completely earned the right to be there.
This is incredibly unrealistic, and can give readers very unrealistic expectations.
Now, you may think I'm complaining about a lack of realism in a science fiction franchise. No, no. I'm complaining about a lack of realism in these characters. We humans are broken things. The dictionary is filled with words to describe our negative character traits. In a captain (the position of ultimate authority in an isolated community) these traits magnify, create conflict, create interest in a story, and Star Trek robs us of that.
A vain captain may require more effort put into the appearance of his ship than in her functionality. A tyrannical captain creates a sluggish, mutinous crew. A grasping or ambitious captain can create an atmosphere of destructive competition.
Yet, we've all grown up watching Star Trek. The captains we've seen have no significant flaws. Captain Picard is the very Avatar of Command. He never loses his temper. He never reaches for glory. He's not shy about combat. He never blames others for his mistakes. For that matter, he almost never makes a mistake. Seriously, can you think of any? I can't. He's an exceptional officer, and we're all quite familiar with him and his habits.
And the other two captains are no better. Sisko hates to lose. In fact, his personality fractures when he starts to lose. But, that sort of flaw works out pretty well when you're fighting a war. Janeway demonstrates obsessive single-minded pursuit of a goal. Well, that's okay if you're millions of light years from home and your task is the safe return of ship and crew. That's like saying in a job interview that you 'work too hard'.
Now let's take your scifi reader. Odds are good they're thoroughly familiar with these characters. These perfect characters. A captain who abuses his authority, even trivially, begs the question from the reader: Who would put this person in command? Without an answer, you run afoul of the reader's suspension of disbelief, and it's all Star Trek's fault.