Although he bankrupted the state through his alchemy, art collecting, construction work and a failed attempt to establish a porcelain industry in Zweibrücken, he was considered a good Duke, especially in comparison to his nephew Charles III who succeeded him in 1775.
Kuigi ta pankrotistas oma riigi läbi oma alkeemia, kunstikollektsiooni, ehitustööde ja nurjunud katse rajada Zweibrückenis portselanitööstus, peeti teda heaks hertsogiks, eriti võrreldes tema vennapoja Karl III kes järgnes talle aastal 1775.