Since it reopened with The Lion King last year, the restored Opera House hasn’t drawn the most inspiring of productions. But it does look great. The 2,600-seat theater is a jewel from the dying days of vaudeville, and it gleams with the sort of Beaux Arts gilt that ought to shame more-modern buildings: chandeliers, murals, even period-style urinals. Now if we could only get some shows to match . . .