Oh come on… why does everyone hate DS9? I liked it. It got especially good once they introduced the Dominion.
There were some select episodes I enjoyed, when they traveled back in time and did the Trouble with Tribbles episode. That was good. On the whole, I think it depends on your preferences. What sets DS9 apart from the other Star Trek series was that — it was less science and more character-driven drama.
Again for me, it was like watching a soap opera in space and I watch soap operas. People either love that or hate it.