Looking at Season 2 so far:
Episodes 1-3: Continued Expansion on the Bajorans in one HUGE burst.
Episode 4: Spiritual follow-up to "Dax" and how different symbiont/host combinations create different people.
Episode 5: Expansion on the Cardassians. Major development for Dukat and especially Garak.
All of these episodes developed things touched upon in DS9's strongest first season episodes. Will the next episode continue the pattern? Let's find out!
"Melora"
A-Story: The jumping off point for the A-story of "Melora" is two-pronged: fix what was wrong with Bashir's character in the first season AND addressing something that's been taken for granted in the rest of Star Trek.
I'll go in reverse order and address what's been taken for granted first: As far back as "The Cage", Day One of Star Trek, when it was established that Talos IV's gravity was "0.9 of Earth", it's been assumed that all the planets have similar gravity to Earth and the humanoid aliens we encounter are used to said gravity. Then comes Melora. She comes from a low-gravity planet, and "normal" gravity for her is so heavy that she has to be confined to a wheelchair in environments where there's nothing else that can accommodate her needs... such as DS9. This episode is an obvious allegory to the handicapped. She's defensive and doesn't want to be patronized or feel like she's a burden.
The other component is Bashir. He spent the first season pining over Jadzia. I'm saying Jadzia and not Dax because to quote Sisko in "Emissary", "I wonder if he would've found you as interesting the last time I saw you?", and Dax said, "Probably not." After "If Wishes Were Horses", I think this storyline was put to bed once and for all. Here, Bashir and Jadzia are completely professional and platonic. What's more, Melora is someone he's genuinely interested in. In stark contrast to the first season where it looked he was trying shallowly hook up with any woman he found attractive.
Bashir wants to help Melora with physical therapy that will allow her to get used to "normal" gravity. She wants it at first, but then slowly realizes bit-by-bit that she's losing a part of herself. Dax serves a character who Melora can talk to about this besides Bashir, who's obviously biased. I liked that Dax compares Melora to Ariel in The Little Mermaid. In "Melora", zero-gravity is like the sea in The Little Mermaid.
When Melora lets Bashir experience zero-gravity it was an amazing scene. But one that also had me wondering: "How did they pull this off?!" It looks so real. Given when this was made, it had to be a practical effect. It's the same thing I wonder about with in Star Trek VI when the Klingons were floating. Can the actors be held up by strings that are so strong they won't break? This is my wondering purely from a technical standpoint. I enjoyed the scene and loved that Melora let Bashir into her world. A world she ultimately decides she doesn't want to give up.
B-Story: This is the weaker part of the episode but still not bad. I think it's used to set up the end, but we'll go to that when we get to it. Anyway... Some Forehead Alien who was arrested six years ago wants revenge on Quark and says outright he's going to kill him. Odo tells Quark he'll keep an eye on this Forehead Alien but he can't arrest him for not having done or attempted anything yet. But he will protect Quark. "I'll do my job... Unfortunately."
The aliens-of-the-week don't look too good in this episode. The makeup budget must've come up short.
Eventually the Forehead Alien takes Quark hostage, takes Dax and Melora hostage, and steals a Runabout.
When the A-Story and B-Story Collide: The Forehead Alien shoots Melora, leaving her for dead. He writes her off. Then, to everyone's surprise, she managed to survive, turns off the gravity, and is able to stop the Forehead Alien in her own element while everyone else is out of theirs. Melora's "handicap" saves the day. Which solidifies her decision to stay the way she is.
Of Other Note: I love the Klingon Restaurant!
Summing Up: The A-story is an 8. The B-story is a 7. When the A-story and B-story collide, it comes back up to an 8. All things considered, I'm going to round up and give this episode an 8.