One problem I had with DS9 is that we were no longer going boldly where no one had gone before, in fact we weren't going anywhere. It lost a fair bit of it's spirit, I mean, it's star 'trek' after all.
Both the first two series, from my understanding, especially the cinematography, were based on old submarine war movies, they had a certain feel and pattern that was missing in DS9. It seems to me that producers dream of a show with a successful formula, there was no need to change it, if they wanted to do a spin off show about an outpost I think they should have continued the trekking as well.
You have to admit that the 2nd series was popular enough to spawn a series of movies while no one was lining up to see DS9 on the big screen. But I should watch it again, maybe I would enjoy it more now. It's been a long time ago and I could only tell you the names of a very few characters. I really disliked the doctor and the ferengi.