DS9 might have been lightning in a bottle. They got so many seasons and so many episodes that we are discussing a character like Jake Sisko (which would be a toss away on any other show.) Though, its more than just quantity of a 24 episode season show that ran 7 years. Plenty of shows ran on 24 episode season schedules and couldn't touch what was accomplished here. Though, if you dig in a bit you can see many writers came over from TNG that ran 24 eps for 7 seasons itself. Thats a lot of experience, world building, consistency carried over. You'd be hard pressed to think of similar examples... Maybe, Breaking Bad into Better Call Saul?