Two of my favourite plolines rolled into one. Picard playing Dixon Hill and a holodeck malfunction. This is the first example to grace our screens. What works very well here is that we actually have a plausible danger hanging over the Picard, Data and Bevs. With the history expert dying, there is a real fear that the holodeck characters will harm our protaganists. Though it doesnt happen, only right at the end is the threat gone with the anataganists suffering a most unpleasant fate! The ticking clock of Picard required to give the welcome speech to the alien race is a great device to keep the intensity level high.
Picard and Bev in costume and in "character" is one of the best parts of this episode, but Data part wins hands down!
A great episode.