Most Troi episodes during the series were mediocre touchy-feely episodes. Fairly or not, the writers evidently concluded that the character or actress could handle on that kind of material.
But here they tried to do something completely different - put her in the center of the archetypical military thriller, with Troi masquerading as a Romulan secret police agent. It's an episode evocative of earlier episodes like "The Enemy" and "Unification".
The episode also plays against our stereotypes of the Romulans. The "good guy" who initially kidnapped Troi is willing to murder 18 people to further his goal; the Romulan commander of the ship, who clearly despises the vicious totalitarianism of Troi's ilk, displays a sense of honor that we were told the Romulans lacked.
A fun one to watch.