Moriarty's back, and he's pissed. Plus Barclay, Stephanie Beacham, La Forge being befuddled (and left-handed), and two planets collide. The TNG Rewatch finds a "Ship in a Bottle."
Indeed, one of the episode’s strengths is how the holodeck versions of Riker, Worf, Crusher, Troi, and especially La Forge act: not especially out of character, but still kind of flat. LeVar Burton in particular does well, as holo-La Forge is utterly unequipped to deal with the revelation that they’re on the holodeck, and he kinda stands there helpless until Picard excuses him, and he wanders off.