I cannot help in case 1813 rings no chimes for you, the Nordarmee - hastened from one victory to the other, the Prussians were of course very critical of Bernadotte and like to bash him as much as Boney fawners, but the end he was cic and much more successful than Boney himself.

The name Bernadotte just ment success whereas Boney - disaster.

Otherwise I agree he was as mediocre as Lannes, Augereau, Ney, Davout - but who shines as marshal? Davout for one day.