Featuring three plot lines and a different tone than Part I, "Descent Part II" isn't a particularly good or bad (or noteworthy) episode. The A story, with Data, Geordi, and Picard, is about Data's path back to morality (thanks in part to "MacGyver" Picard, who sure knows how to jury rig a kedion pulse!) Unfortunately, Lore's control over Data (with "drug dealer" parallels) and the Borg dealing with emotions are issues that are all but buried, and Data's return to the path of righteousness is not nearly as interesting as his descent into darkness. (And the Borg suffer a blow when Picard shows us that all you have to do is pull out a hose and they break down like an old car.)
The B story, which sort of comes out of nowhere, is about Doctor Crusher commanding the Enterprise. It's predictable but mildly entertaining. Unfortunately it takes time away from the C story, which features Riker and Worf in their attempt to rescue Picard and company.
It's disappointing, but watchable, conclusion.