Untruths, dramatic evil soundtracks, outright provable lies and demonization of Sarah Palin marked the film as bad propaganda. If the movie was targeted toward other progressives it may have been successful, but it is clearly targeted at independents and conservatives. Undertones are meant to give people negative emotional reactions to the Sarah Palin caricature. Republicans are characterized as racist and violent as forboding music plays. The dumbest aspect of the movie was the revisionist claim that Sarah Palin is responsible for McCain's loss and Barack Obama's presidency.
The progressives who made this movie are misguided. They mistakenly believe that the audience for HBO political movies is as immature as the tweens they normally target with propaganda. They simply have not clued into the fact that progressives are the establishment. Progressive is not "in" anymore and all the hateful rhetoric and 1930's style dehumanization is just #FAIL.
Post ScriptIt seems that cancelling HBO is also becoming "cool."
Someone should also mention that Game Change is an attempt to counter The Undefeated (2011) that is currently showing on Reelz.