In Mockingjay, the tone and theme diverge drastically from the first two in the series, moving into what initially feels like the logical 'next step' in the rebellion against a decadent and unjust government. But what it becomes feels largely like a speculative war novel. Nearly all character development is suspended into a shared state of post-traumatic stress disorder that left me frequently battling the urge to skim. I gained empathy with a few side characters, but lost it with the primary characters.
The ending, too, fails to satisfy. It feels more like a rushed documentary, and entirely too summarized. It didn't help that, by that point, I was no longer invested in anyone's fate. In the end, I can only recommend the first book in the series, as the second book more or less forces you into reading this one.