DS9 is fantastic Trek, if you get an opportunity to watch it all the way through you should go for it. Much of it is story arcs so watching them randomly doesn't work as well as with the other series.
At least I am in luck with this one - "11" started playing them from the beginning when for some random reason they stopped showing TNG. I am limited by what I can see on free to air. I must say - that first episode of DS9 blew my mind. I have watched a few with the rest waiting on my DVR. I would have loved to see Voyager and TNG for that matter from the very start.