Of course Deep Space Nine
was Deeper, it's in the very name of the show. Sorry, just a little joke.
I agree with the general consensus, it simply didn't appeal as much to as many as TNG. I think part of that may be that TNG survived it's rough start, because it was the only game in town, DS9's rough start wasn't as easily forgiven, because TNG had already found it's legs and was going strong. Disclaimer: I personally enjoyed DS9 from the beginning, so, for personal taste, it didn't have a rough start, I enjoyed the Bajoran Politics & Religion and missed that aspect when it dropped into the background
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?