Here is a sampling of what they had to say:
Benedict Nightingale of The London Times: "David Mamet's Life in the Theatre lasts 85 minutes, but, unlike some pieces that are eons longer, it packs three plays into its short, enjoyable span… The acting in Lindsay Posner's production is a bit unequal. Stewart displays the subtle, witty skills he learnt in the great days of the RSC and somehow retained during the long years of Star Trek, and not only when he is in the dressing room or backstage, but when he is supposedly onstage, performing extracts from dumb, dopey melodramas. The trouble is that it is he who is supposed to be in decline and Jackson's John who is on the ladder to success. You could not tell that from the decent but unremarkable performance given by the actor from TV's Dawson's Creek."
Nicholas de Jongh of The Evening Standard: "David Mamet's romantic view of the delights and difficulties of the acting business famously found expression in A Life in the Theatre. I was never much persuaded by Mamet's fusion of low comedy and high pathos, or his attempt to explain what he loves about the company of actors. Lindsay Posner's new production leaves me cool… The main trouble, apart from the muted direction, is the casting. The latest actors to put this double-act drama on stage--noted English classical actor Patrick Stewart and Joshua Jackson, Canadian star of television's teenage soap Dawson's Creek--are about as compatible as roast beef and a knickerbocker glory. Roles that demand close, sinuous, and ambivalent interplay, the subtle stirring of undercurrents of tension, are rendered down to a bland, bored politesse."
Paul Taylor of The Independent: "Patrick Stewart is wonderful now in Lindsay Posner's highly adroit production of David Mamet's A Life in the Theatre… Unfortunately, neither the excellence of the directing, nor the slow-burn drollness of Joshua Jackson's performance can disguise the anorexic dramaturgy that is on offer here. You leave the theatre thinking: where's the show? And the tickets are too expensive to make you feel that this is a some kind of luvvie joke."