With an "alien species manipulating the crew" story that's more common in earlier seasons, "Liaisons" tries to mix the drama of a "Misery" like story with the comedy of a "3rd Rock From the Sun" like story. The result is a bit awkward.
Patrick Stewart tries his darndest to salvage the weak A story about a woman trying to keep Picard trapped with her, but if it ain't on the page, it ain't on the stage. Michael Dorn fares better in the B story which takes advantage of his underrated comedic talents. Troi gets some screen time in a C story that doesn't really amount to much more than enjoying dessert.
In fact, "Liaisons", with no connections to any other episode, might be the most forgettable episode of the series, only notable for being one of three not to have any bridge scenes.