I'll grant you that the scene with Data and the dice was pretty fun to watch especially with Ron Jones' music hitting all the right cues. It's just that the amount of padding we have to sit through in order to get to that point just reminds me of how much time was wasted. The fact that the episode just ends with a "we may never know!" kind of qualifies the Royale as an episode you can skip and not miss anything.
And for all it's story points, TOS's "A Piece of the Action" (Aliens mimicking a human book) and DS9's "Badda-Bing, Badda-Bang" (Solving a scenario in an artificial casino setting) did it a whole lot better.