My thoughts on Deep Space Nine are as follows:
The show started out kind of different and interesting. But then after a couple seasons, they started to lose confidence in DS9 and started doing everything it could to make it more like TNG. For example, bringing in Worf and thusly, the entire Klingon story ark from TNG. Sisko now had to be made a Captain and given his own little starship, so that the base is just a platform, more or less for the Defiant and its exploits. Bringing back all of these TNG elements and making DS9 fall more in line with traditional STAR TREK really hurt its claims to being a "unique" series.
I think that is a very superficial analysis. I don't mean to insult you, I am just saying that because Worf is on the program doesn't mean that every Klingon storyline was meant as a ripoff of TNG. Just because they had a ship, doesn't mean that they lacked an original premise. I mean, all
Star Trek series had a ship, except DS9 for the first two seasons.
DS9 had a warship
. It was built to defeat the Borg and used to defeat the Dominion. It's showing the change in mentality among Starfleet, and allowing DS9 to have more weapons than it had. They had good and original ideas with that ship.
In a show about oppression, the Klingons give the Cardassians a reason
for joining the Dominion. We knew they were the enemies and most shows wouldn't bother to do more than just have them join. If you look at the oppression story lines, it fits perfectly. Remember Robert Kennedy's words: "Violence breeds violence, oppression breeds retaliation
." Dukat makes them STRONG again! They were a BEATEN people.
They put the Federation in the position of being conquered and become what the Bajorans were under the Cardassians--oppressed. It drives home the story lines about oppression.