Maybe it just isn't as popular outside the die-hard Trek fans. I rank it above voyager, but only in that I never bothered to watch voyager after the first (dreadful) season.
I've grown to like DS9 more after rewatching it over the years it's been on Netflix, but even during it's first run when I was starting to get sick of all the war episodes I still liked it way more than Voyager.
I've watched all of Voyager, and while it does improve somewhat in the last few seasons it never rises above DS9, over the entire series there are a handful of episodes that might stand up against it.
I guess there are people that would rate Voyager higher than DS9, but I have never run into anyone that does. I'd even put Enterprise above Voyager.