Hey y'all. So I've been watching a lot of DS9, lately. It's a bit of the "black sheep" of the Star Trek franchise, as it goes too far away from what Star Trek is about, people claim. While in certain ways this claim is true, it's also partially false.
One of the more ridiculous claims about this series is that it's not Star Trek because it's not a "trek": none of the characters are going anywhere to discover new worlds and whatnot. This is very silly, because quite often Next Generation set exploration aside in favor of putting depth into the races and worlds already created. The "Star Trek" label is now a label of a franchise, and only the first series and Next Generation (because it appeared after a long hiatus) were obligated to trek. It's okay for there to be a side story or spin-off that focuses on things that aren't entirely unknown. Yes, this changes the focus of the series, but that in itself doesn't make it bad. Of course, if it's one's personal taste to prefer exploration over a space station, that's fair enough. It's just not an objective concern.
However, there are objective complaints about it. The primary one is that Deep Space Nine betrays what Roddenberry intended in having an ideal universe where people learn to get along. For a series in Star Trek, this is hard to accept. Some argue that by having people act more realistically, the show is better. On an entertainment perspective, I agree. On the other hand, Star Trek is made distinct by its idealism, and the goal of Trek was never simply about being entertaining. It was to create something new and refreshing, with the belief humanity could improve itself. While I feel that much of this philosophy is humanistic bunk, it was hopeful and fun in its own way. In the original series, anyway.
So if you want to say that DS9 is too non-idealistic, that's certainly true. It can also be argued that this series is more entertaining than the others. It's certainly more entertaining than Voyager (a collection of mostly bad actors) and Enterprise (boring and insensitive to canon).
In any case, let's just talk about Deep Space Nine, shall we?