Wot no Ron Moore?
How could you write a DS9 retrospective without a mention of Ron Moore?
DS9's first and second seasons were pretty dull and often by-the-numbers TNG-era Trek under Bermann, but when Ron Moore took over as showrunner on season three it transformed into something dark and exciting, but often fun, and so inventive. The characters became three-dimensional people you could care about, he took Worf to a new level, and the final season space battles were stunningly choreographed.
Moore went on to create possibly the best TV sci-fi ever with the BSG reboot, and if you look back at DS9 it's like a trial run for some of the themes he explored so well in BSG.
B5 had great spaceship designs, some promising themes and great characters like Londo and G-kar, but it was often pompous, JMS couldn't write dialogue for love nor money ("Get the hell out of my galaxy" has to be one of the worst lines ever televised), and it never delivered on the promise of the first two seasons. He might blame Paramount for nicking the premise, but DS9 delivered the goods under Moore's leadership.