Sir Ian McKellen is now the most feared drama critic on the West End thanks to his turn in “The Critic.” McKellen leads the adaptation of Anthony Quinn’s 2015 novel “Curtain Call,” which centers on an aging — but iconic — journalist who teams up with an actress (Gemma Arterton) to exact revenge on his newspaper’s new owner (Mark Strong). The film is set in 1934 London. “The Critic” is written by Academy Award nominee Patrick Marber (“Closer,” “N…