Links to some of the reviews of the London production.
Guardian: 4 out of 5 stars
http://www.theguardian.com/stage/2013/jun/18/the-cripple-of-inishmaan-review "Radcliffe also has the precious gift, vital in a play full of narrative surprises, of seeming artful and vulnerable at the same time."
Telegraph: 5 out of 5 stars
http://www.telegraph.co.uk/culture/theatre/theatre-reviews/10132775/The-Cripple-of-Inishmaan-Noel-Coward-theatre.html "Physically and emotionally, it is a stupendous performance he delivers, and he has to do much more than just “talking.” The accent, the walk – every bit as brilliantly conceived and executed as Antony Sher’s Richard III – and, above all, the humanity that he manages to achieve for Cripple Billy make this the finest piece of acting I have seen all year."
Brantley
http://artsbeat.blogs.nytimes.com/2013/06/27/london-theater-journal-daniel-radcliffe-as-cripple-billy/?_php=true&_type=blogs&_r=0 "They’re all freaks in Inishmaan. What human being isn’t, if you look closely enough? Mr. McDonagh’s awareness of this sad, funny fact of life is what makes his portraits of the bored so fascinating. Mr. Radcliffe grasps that perception with sensitivity and firmness. His performance is remarkable precisely because you realize that his character is not."