We know the Vaadwaur are bad news from the beginning, and it's satisfying that Voyager's crew figures it out well before the episode's end. Moreover, the way they figure it out is really cool, with Neelix researching the linguistic legacy of the Vaadwaur name. Who Don't Like Nosy Strangers. Voyager Lands on an Alien World. Who Might be Allies.
Good Aliens Are Actually Bad Aliens.
Voyager Escape the Bad Aliens. Now, originality isn't a must for a god episode. But even within this tired formula they could have made some stuff seem new if they'd tried. The best example of this is the One Good Alien, Gedrin. I mean, he is part of the last Vaadwaur battalion.