That's a terrific and honest line from Sisko IMO.
Calling the DS9 writers "immature"? DS9 is hands down the most mature Trek show made. It was an adult show with adult stories. It was a modern 21st Century TV show that happened to be made made in the 90's the way many consider a show like Hill Street Blues from several years before.
How is it any more
mature than TNG? Because it has war stories? Holosuite brothels? And what does that have to do with the writers showing immaturity? Nothing. Nothing at all.
But as far as the
tone of the show, TNG has a sense of professionalism,
maturity, and sophistication that is greatly diminished in DS9(and VOY). The characters on DS9 act more immature, back-bitey, bickering, complaining. The series takes on a less mature tone in other ways, like the adoption of sitcom plots, soapy relationship drama, frequent Ferengi hijinks, etc. Just because it more frequently visits more bleak material doesn't make it more m
ature
That's not what the word means. If you see a TV show or video game marked "mature" that doesn't mean the content or tone is more mature, but that it recommends the audience to be mature(a grown up, responsible, conscientious, able to make sound decisions, etc).
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Here's why Sisko's line makes no sense in context of the story- He's calling out his leadership as being naive, hypocritical, and oblivious to the facts on the ground because "they live in paradise, and it's easy to be a saint in paradise." This makes Sisko look narrow minded for failing to see the big picture. These admirals have been dealing with the Cardassians for longer. They just ended "the bloody, bloody border wars" or whatever O'Brien calls it. They have experience with them. Sisko says "open a dialogue with them...what does she think I've been doing?!" Well, he omitted that fact from his report to her. She's concerned with the bigger picture, and for all of the rest of the story besides his rant about "paradise," Sisko sees the big picture too, so his rant comes off as the writers throwing some shade at "The Federation/Earth," and is out of place.
I love DS9, and just as much as TNG, but for different reasons. It's its own show. Rankings ultimately can be reduced to "I currently get more satisfaction from X than I do from Y"