LCARS here. We took a week off from our normal viewing, but before doing so we watched s2e3 Projections. After it ended, we both independently decided that it deserved a perfect score—the first we've given!
This episode is very much in the “nothing is what it seems” or “everything is wrong” vein that crops up several times in Star Trek, and that's always compelling. It's also an episode focused on the Doctor, and that almost never disappoints. These two facets colliding together is what makes the episode so good. As a computer-created hologram, the Doctor should perceive the world exactly as it is. When his perceptions are challenged it's even stranger and more intense than when a flesh-and-blood member of the crew is unsure what's real and what's not.
The one shortfall of Projections is that it doesn't really work in a vacuum. If this was the only episode of Voyager you ever so, it probably wouldn't land as hard. Some of the legendary TOS and TNG episodes like Darmok, Inner Light, and Balance of Terror require very little context beyond what it's in the episode. Projections requires a basic knowledge of the show and its characters to work.
It's not required that great episodes also live in bottles, but it certainly doesn't hurt. I love Deep Space Nine, but I would be hard pressed to pick a favorite episode since that series isn't so much about episodes as it is arcs and characters. Voyager is definitely easy mode compared to the massive storytelling of DS9, but it's enough to make jumping in cold difficult.
One programming note: Comicbook.com reports that a Voyager documentary is in the works! From the post:
The film is the next project for 455 Films, the studio behind Star Trek documentaries The Captains, Chaos on the Bridge, and For the Love of Spock. The studio's president, David Zappone, was also an executive producer and co-director on last year's What We Left Behind: Looking Back at Star Trek: Deep Space Nine. Zappone hinted plans for the film on social media.
“Okay. Who likes Star Trek Voyager, and thinks it deserves to have a documentary to commemorate its 25th anniversary?” he tweeted. He then confirmed the project is in the works and the filming will commence during next week's Star Trek: The Cruise IV. The film's crew will be on the ship during its week-long voyage to film testimonials from Star Trek: Voyager fans.
Of the documentaries cited in the article, I've only seen Chaos on the Bridge and What We Left Behind. The former was interesting for me as someone who doesn't have any behind-the-scenes knowledge, and the latter a love letter that was a truly satisfying watch. That's to say, I'm optimistic!