It honestly feels like Ms. Collins wrote this because people were incessantly nagging her to return to Panem. It's a passable read but doesn't feel like she put her all into it. Interesting in parts, shamelessly plugging Katniss in others, and pushes through plot points like they're a chore.
If you're a huge fan, you'll love it. If you're a fan only in passing, it's something to do if you've got time for a 500+ page jaunt.