"Gambit" was among the highlights of TNG's mediocre final season. It's a convoluted, exciting adventure that doesn't really challenge the viewer but provides plenty of entertainment - much like an Indiana Jones movie.
We have the Vulcan triple agent, Data in command and dressing down Worf for insubordination, James Worthy as a Klingon, a "health and safety inspection", Riker getting thrown in the brig by Data - they really threw the kitchen sink in there, didn't they? And yet the conclusion is perfectly satisfying - a dangerous talisman disabled by the good guy's wits. A worthy addition to the TNG canon.