See, Russel Brand can do sloshed Brit. In fact. I believe that is his natural state. But. He cannot do endearing. The only reason why Arthur worked (well, apart from Liza Minelli being easy on the eyes and John Gielgud being wonderful, was that despite Arthur being wrong in every way, Dudley Moore was sweet. If Arthur is not sweet, the film cannot work. Because then his only good quality will be his money. And that would be tragic.