A Mighty Heart: 7 out of 10.
I'll admit to having a little difficulty seeing Mariane Pearl on the screen when all I could see was Angelina Jolie. That's not to say Jolie is weak in this, because she's very good, but she's morphed into a characuture that dominates the screen.
It's still worthwhile viewing because even though we know the story and how it ends, it's still a compelling journey.