HDT, maybe Katniss doesn't do a great deal in Mockingjay, but what is she supposed to do? She's too important as a person to send in and let her go Rambo on the opposition. Considering everything she does do in Mockingjay results in her being hurt in some way, that helps to reinforce the notion that she is not superhuman. She's not much use as "the Mockingjay" if she gets killed fighting Peacekeepers in district 8.
Of course she is. By the end the entire plan is to get her killed because she's more use to the rebellion dead than alive. They needed her to do some propaganda videos, sure, but there's no excuse for, say, the Peeta rescue mission, which was summed up in a few paragraphs basically as "The rebels planned a mission to get Peeta back, and then they did, and he was back."
But my main issue with it isn't whether or not it makes sense that Katniss isn't doing anything for most of the plot, it's that a story in which the main character does so does not make for an interesting book. <_<
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