In a recent interview, Richard Griffiths, Uncle Vernon from the Harry Potter movies, who is in the West End play Equus with Daniel Radcliffe, commented on his younger co-stars ability to perform by saying:
You have to make them look better, because that will help you. And that's something I'm used to doing -- helping other people on stage with me to get on. But not with Danny Radcliffe -- he's going to be fine.
Richard also comments on the lack Uncle Vernon in the last movie but states about the fifth movie:
With this fifth movie, Vernon is much more frightened of Harry than vice versa, and as it goes on, you see that it ends up with Harry as the master and Vernon as the shivering idiot, the shivering coward.
The director of the play, Thea Sharrock, discusses the play as well as Daniels portrayal of his character and the need for nudity and how Dan pulled it off:
The peculiar life Dan's led has prepared him for things that most people will never have to deal with. To watch the ease with which he deals with things is extraordinary and immediately gave me great faith in the fact that he had as good a chance as anybody of pulling it off, if not better.
UPDATE: An additional review of the play can be read here.
UPDATE II: You can see some pictures of Dan here from the first night of the play, courtesy of Lumos.