Most of DS9 once the war kicks in is war war war, and personally I don't even think that well done
Actually, I have found that one of the primary sources of complaint directed toward Deep Space Nine's last two seasons is there being too many episodes that don't
tie into the overall war arc. Episodes like "His Way," "Take Me Out to the Holosuite," and "Badda-Bing, Badda-Bang" are often derided for their seeming inconsequence and lack of relevancy to the overall plot. I, of course, am in in complete disagreement with these criticisms though
So it can't be said that DS9's sole focus toward the end was the Dominion War. In fact, by that point, the show had built up a variety of other interweaving storylines such as those involving the Prophets, Ferengi, and countless individuals characters that only occasionally intersected with the War.
I don't think most people would say that the early seasons of DS9 are on par with the later seasons of TNG. Much like TNG, DS9 took a couple of seasons to find its footing.
Count me in as someone who vastly prefers DS9’s early seasons to the final years of TNG. At least in my view, Deep Space Nine had already surpassed the average quality of its illustrious predecessor half way through its second year—especially when compared with TNG’s seventh season, with which it ran concurrently.
The seventh season of The Next Generation embodied what that series had become in its later years: a lazy, pompous, unambitious shadow of its former self. Though TNG season 7 had a handful of great episodes such as “Parallels,” “Lower Decks,” “All Good Things…”, they were lost in a vast sea of mediocrity. (In stark contrast, Deep Space Nine’s seventh season was busy introducing new characters and elements, telling daring new stories, and shaking up the status quo.)
Meanwhile, as The Next Generation drifted further into complacency, Deep Space Nine was blooming into the vibrant, complex tapestry it would become for the remainder of its run. After kicking off with a risky series of episodes in the form of the Circle Trilogy, DS9 season two made a concerted effort to establish its own identity by further incorporating its colorful array of recurring characters and adding to the intricacies of its primary alien cultures and the changing scene of interstellar politics. Finally, the season culminated in the introduction of the Dominion, the Alpha Quadrant’s most multi-faceted threat.
In the end, it’s all a matter of personal preference. However, I do feel that TNG’s sixth and seventh seasons are afforded an excessive amount of leniency compared to their contemporary DS9 seasons.