Reviewed by GREG KING Director: Maya Forbes Stars: Mark Ruffalo, Zoe Saldana, Imogene Wolodarsky, Ashley Aufderheide, Keir Dullea. Mental illness is a difficult subject to tackle, but it has often been explored in films, with the Oscar winning Rain Man, A Beautiful Mind, etc, being some of the standouts. But it seems that Infinitely Polar Bear sometimes hits a few false notes, and is never as engaging nor as …