I never cared for the Ferengi, on either DS9 or TNG. I mostly hated those episodes. But Quark, and Nog, as characters were better than when the focus was on Ferengi stories in general. Especially when he sparred with Odo. But don't get me started on Zek and Moogie...Every time I watch DS9, I gain more appreciation for the Ferengi episodes. DS9 did a great job turning them from annoying aliens we saw in TNG to an actual race in the Alpha Quadrant and their arc really decent.

1-11 The Nagus
While I like Quark as a character (especially when sparring with Odo) I generally loathe the Ferengi. Not for the "obvious" reason of them being greedy, selfish pricks, but because of the ridiculous and over-the-top anti-capitalist crap that they are stereotypes of. Gah! We get it, the supposed "evolved" humans of the 24th century have moved past that now… Geez! The thing is that this evolved Federation attitude in the end comes of as not only condescending but also racist, which is quite ironic. But then I've often encountered supposedly enlightened people and they have turned out to be awfully boorish and prejudicial.
So, with the above said, it should come as no surprise that I didn't like The Nagus. The comedy didn't work and I frankly found it offensive. I admit it was slightly amusing to see the shameless rip-of (or homage) to The Godfather.
But I did like when Jake in secret kept teaching Nog, and Sisko's approval.
However, I must grade this one as very much below average with 3-.
1-12 Vortex
I really liked Vortex. We get a glimpse into Odo's origins and we're as curious about them as Odo is himself. It's very intriguing and quite poignant. For the first time I could really feel the terrible loneliness that Odo must feel being the only shapeshifter he knows, and now he learns that there are others somewhere in the Gamma quadrant.
It was also rather moving to see him display a compassionate side when he learned the true story behind the fugitive Crodon. He even smiled at the little girl. The performance by Crodon was a little so-so, at least at first. And I recognized Randy Oglesby (ENT's Degra) as the Miradorn twins (a neat concept by the way).
The episode did raise some odd questions about shapeshifter/changeling physiology. How much does Odo really weigh? As a glass Rom had no problem carrying him on a tray, but as a humanoid Crodon thought he was heavy. And how could he get knocked out like that, just like a real humanoid. Wouldn't he be protected by the fact that he's just a big blob of dough? For that matter, when he's unconscious wouldn't he return to his "blobby" self?
My grade for Vortex has to be an above average 7-.