The Bavarian State Opera is the largest house in Germany and among the most difficult to characterize in a few words. Vocal standards are high, orchestral standards superlative. No one has suggested that Kirill Petrenko, Kent Nagano’s successor as music director, has done anything to let the latter sag. Then there are the productions, often reflective of directorial excess at its most exasperating. But often does not mean always, as two performances over three days recently made clear. Relatively new to the lineup is Salome as staged by Krzysztof Warlikowski, the Polish director who also furnished the BSO with its “Brokeback Mountain”…