You can tear apart any movie, break down the technicals, etc. but as this story is well known to aviation and WW2 history buffs, the majority of ignorant Americans don't have a clue of what happened, to who or even why we were at war. You know what I'm talking about. Its important to teach history to the majority and even if by Hollywood standards, this movie accomplishes it very well plus you can take the family to see it.
Actually there are quite a few documentary films of the Tuskegee airman but never anything done on a Hollywood glorified / promotional level powered by someone like George Lucas.
Also, I don't want to jump too far off the topic but I recently watched another WW2 era movie called City of Life and Death - a foreign film made in '09. Skip the US version of Nanking but do see this important film. Impact, stunning, gory, perverse, incredible moving and superbly done.
City of Life and Death (2009) - IMDb