Ew, Babel. This episode would have been more at home during TNG's first or second season. The dreadful starship/station disease plot has been done before ad infinitum by this point, and the virus had boring symptoms. There's a race against time, but we know everything will be alright by the end. Meh.
I agree that Odo and Quark salvage the show somewhat. I also liked Sisko trying to keep Jake calm - there was a hint at emotion in that scene. Kira being a bit gung-ho in getting the scientist guy at the end was also fun.