Interesting question MM. I saw Alan Rickman and Helen Mirren in Anthony and Cleopatra, and though I admire both of those actors, they were not good in that particular play and it was very disappointing. No matter how much I liked the play, I couldn't get over the lack of chemistry, and the lack of theatre craft those two actors showed, though they are undoubtedly brilliant on tv and film. But then I recently saw Mark Rylance in La Bete, and he was so jaw droppingly brilliant that I can't believe it would be the same with anyone else. Seriously, if you haven't seen it and it's still on with him, then do. It's a tired phrase, but he has created a work of truly comic genius that trascends the writing. It's kind of like asking whether you should divorce the art from the artist. Do you appreciate a piece of work for what it is, or do you take its creator into account when you consider it? Does the fact that the "Diving Bell and the Butterfly" was written by a paralysed and dying man blinking out each letter to make each word make it a better book?