I just think people never really gave it a chance and let the story develop over time,
This is a little unreasonable. You can't expect a audience to just hang in there to see if a series changes into something interesting or develops over time. There are a lot of shows out there. For instance, I hung in there with Stargate Universe for a dozen episode before I kicked it to the curb, it currently could be the best show on TV today and I wouldn't know it (I understand it's not), Flash Forward is another sci-fi show that I simply dropped, from a
VERY interesting first couple of shows it disintegrated into goo. With neither of those two examples did I (or too many other people) really give it enough of a chance.
Looking at DS's ratings, lot's of people did try it out.
I know some people who started out watching DS9 but let it go because it was too dark ...
Some fans loved the darkness, they (mistakenly?) think it made the series "realistic." What I saw were people making a series of poor moral choices. James Kirk made hard choices and never lost himself in the process. Ben Sisko gradually lost himself through the years, he never pulled back from his various compromises. Each compromise was reasonabe in of itself, but they built up. I want to be able to look up to the series lead, it got to the point I couldn't do this with Sisko.
TNG, the Federation was at war (hot and cold) with the Cardassians though out the series run, but the show didn't dwell on the war, even though entire episodes were devoted to the war, not entire seasons. The Dominion were the latest evil group. they really had no reasonable point of view. If the Dominion had had a truly legitimate grievance against the Federation, well it would have made the whole war thing less tiresome for many.
And by "many" I mean those who stopped watching.
And what's with all the season 1-2 hate??
Not hate, more objective observation, or personal perspective.
since there was no exploration involved.
This is one of the things (also) that got me about DS9 in general. All the other series engage in
some exploration of "the final frontier." In DS9 it made it seem as if the entire Alpha Quad was like twenty first century Europe, nothing but wall to wall governments as far as the eye can see. There was no Magellan, no Lewis and Clarke, no vast oceans, no open territory to explore and encounter new things.
And when they did journeyed into the far distance and mysterious Gamma Quad, what did they discover? Why yes, another big government (the Dominion). But wait. The Dominion didn't encompass the entire Gamma Quad, there was plenty if other area to explore right?
Wrong, we'll be spending (expending) all of our time with the Dominion. And for the most part only with three of the Dominion's races.