Deep Space Nine was my favorite of all the Trek series'. (Any doubters should check my screen name.) It was the one show that didn't have candy-assed commies looking disdainfully down their noses at the fruit of the sweat of a man's brow (money), and wasn't so up to it's eyeballs in bending over and grabbing the ankles for another "negotiation session" with the enemy.
And then of course, there was the Defiant, the perfect wet dream for a technophile such as myself...
I liked DS9 too. It had a good story although I felt the ending seemed abrupt. Babylon 5 did it better, IMO, but for Trek DS9 was pretty good. I liked Enterprise too, even the goofy time war arc.
Voyager, I watched for the cute blond chick and then for 7 of 9. It was almost predictable that at the end of every season they cut 10,000 light years off their 70,000 light year journey home. And as I recall, the pilot episode was pretty good.