Yes, Talleyrand wasn't reliable, but he had political convictions. He wanted an oligarchic, bourgeois, liberal regime (wether with a King, or with a republic, on this point he was really.. pragmatic to Say the least). He was far from being an indealist, but as a "businessman" he wanted a political regime favoring "business" and money. I can't see how this regime would have more corruption than the Directoire, the same goes mismanagement, it couldn't be worse than the Directoire. As for totalitarianism, Sieyès, Cambaceres, Talleyrand, etc were moderates. They could be as corrupted as the other leaders Of the former regimes were, but they couldn't be as totalitarian as Say the Jacobins (Robespierre, Saint-Just, etc).