I'd say, keep your ceiling dark as possible. My gameroom's ceiling is 18' cathedral styled with galvanized steel completely skinning the ceiling. I use only 2 dimly lit sconce lights for accent. It looks cool and dramatic, but I get annoying reflections on the pinball glass. It's not bad enough to change it, but I would not repeat it again in a room loaded with pins.
Your mileage may vary...
Steve-o