'A Mighty Heart' has anyone watched this movie?

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Yesterday i rented this movie from one of our nearby library but the CD does not read in my computer i wanted to watch that because i heard its the true story of Daniel Pearl's life and death. But my friend told me that its not worth watching so better ask the money back but before taking any decision i want some suggestions from mylot friends whether i' ll rent from another library or just ask for another movie. If anyone of you here have watched it than please speak out what you think about this movie 'A mighty heart'. Thank you all.