In the first instance I remember hating DS9 on principle. The principle being that it wasn't TNG.
When I got over that, and gave the show a chance, I found that it was pretty good. Towards the end of the first season it got very good, and then during the second season it got even better. By the end of year 2 I'd been completely won over.
I stuck with Trek all the way through Voyager, through Nemesis, and through Enterprise, but for me, DS9 was really the last time that Trek was brilliant.
It also helped when I stopped comparing the show with B5 in my head, and just accepted them both for what they were, great shows.