I agree with some of these.
"The Ascent" had a plot like some B-grade or C-grade afternoon matinee movie from the 70s or 80s, but had some excellent location shooting for a franchise more famed for making the same cave look different over and over again. It's definately different from other DS9 eps (not as different as VOyager "11:59" was), though it's not bad at all. I kind of think many people even forget this episode existed! Seriously, a major Odo-Quark episode, and it rarely gets mentioned?
"Move Along Home" doesn't deserve all of the vitriol it gets. I saw it again in 2010 after having last seen it sometime in the '90s, and all the scenes people cringe at, didn't seem remotely as bad as they made it out to be.
"His Way" deserves its reputation. In fact, it deserves "Move Along Home"'s reputation. It has the plot of a lame 1950s/early 60s movie. I've seen a lot of 1950s and 60s movies, there were many far better ones to emulate. Who at DS9's production staff was obsessed with Sinatra or Tony Bennett? All it was missing was Odo singing "I left my bucket in San Francisco". Fontaine is only good in "Paper Moon".
"Rules of Engagement"? It's mediocre. Sisko should have channeled Perry Mason, the Klingon prosecutor Hamilton Burger. Not bad, just mediocre.
"Second Skin". I'd agree, very interesting episode, good story, should be in the top 10th of the series though doesn't get mention alongside other top-tenth episodes.
"Civil Defense" is good. For a bottle show, the premise is great (Voyager's "Worst Case Scenario" gets similarly bashed when it's an interesting episode, perhaps more appreciated by those of us who grew up on video games than on those who only played video games when older). The episode seals Dukat's reputation as a total ***hole. Before he realizes he's trapped too, he exudes that. Him being caught in his own trap because his superiors didn't trust him at all was funny. It also builds Garak's reputation as much more than "a simple tailor" (along with "Second Skin" obviously).
I'll add to the list these:
"Necessary Evil"- Great episode, added layers to the backstory of DS9, actually showing us Terok Nor, something the other Star Trek series never did. Great Odo episode too. Haven't seen "Things Past" in a while (ummm, over a decade) though so can't comment on that.
"Shadowplay"- not as underrated as others, the whole hologram element seems to make it written off, like the fact it was imitated (ENT "Oasis"). I don't see people writing off VOY "One" because of ENT "Doctor's Orders". Saw this again recently, the guest stars really played their roles memorably. Just a nice episode.
And honorable mention, "Rocks and Shoals" for the hell that episode put the cast & production crew in: filming in over 125°F heat.
And Season 7 did tend to have a weaker lineup of episodes. Of course, at least Season 7 didn't make "Once More Unto the Beach", where those old Klingons invade Risa, to relive some of their glorious spring breaks, like the glorious battle at Trader Vic's, where they beat their rivals in a blood wine drinking contest, Ka'pla-*burp*.