Hate and love are intensely subjective experiences and any attempt to conduct an objective study of something that invokes such strong emotional response can hardly be balanced or useful.Hitler has often been subject to unwavering admiration or alternatively dogmatic vitriol,rarely a balanced study,atleast not in popular communication.
This owes much to the fact that most of the literature on Hitler,in print,electronic or in entertainment,have their source in people and societies, who were not in a position to adopt an indifferent attitude to the emotional responses Hitler aroused.
This does not mean that attempts to,like his indian movie, subject Hitler to scrutiny by those outside this emotional perimeter will be more objective or that their investigation will be free from the coercions forwarding agendas that are not central to the principal subject,far from it, this Hitler versus Gandhi theme is probably a mere substratum to the main discourse of Hindu nationalism vs Nehruvian secularism,which the movie maker probably want to touch.
Bollywood is not always known to make indepth and penetrative investigation into personalities and historical events of tremendous political and social significance and document fresh insights in areas already well trodden,but its going to be an interesting fare.
P.S:There was a German movie called 'Der Untergang' which chronicled the last days of the Third Reich and its leadership hunkered in their underground bunkers in Berlin.The movie was remarkable for its lead actor,Bruno Ganz,who played the aged and increasingly delirious German Fuhrer,to a chilling finesse.