Some productions are tremendous on their first outing and never quite manage to recapture the same brilliance in subsequent revivals. Others discover that they need an initial outing before they find their feet, and the Royal Opera’s Rigoletto, from its Director of Opera Oliver Mears, would seem to fall into this latter category. It first appeared last September, but, aided by an outstanding cast, its first revival feels leaner and meaner in a great many ways. The good news is that...