So... this was a completely self-indulgent bit of nostalgia. That said, I have very little shame. I liked it (technically this is a 3.5). 
 There's a lot to like about this, especially for what's technically a kid's comic. AtlA was never a classic in the sense that it didn't really do anything new, but it did do a lot of things right. The comics appear to have continued that tradition. 
 Rest of review contains spoilers: 
 (view spoiler)[The main plot is excellent. Zuko's desperation and paranoia come through both in the dialogue and in the artwork. His conversations with Ozai, in particular, are appropriately creepified. 
 Aang's indecision, while in character, is slightly harder to swallow, particularly when he takes off in the middle of battle to get his head on straight. Timing is everything, and that was... awkward. 
 Really, though, for the most part this comic felt very true to the characters and the world's scenario. And if things do tie up a little more neatly than is realistic? Well, it's forgivable. 
 The one part of this comic that fell utterly flat for me was actually Toph's sideplot. While it is established that Master Kunyo is not a good guy, it is clear that he was ousted from his Training Hall as part of the Harmony Restoration movement (supposedly, he too is from Yu Dao). I kept waiting for the sideplot to resolve in some sort of cooperative schooling effort (to tie back in to the main plot)... but it didn't. Instead, the story supprted Toph's rag-tag students as they learned to believe in themselves. 
 Awful Kunyo may be, but Toph is actually in the wrong here, and the fact that it's never addressed doesn't sit well with me at all, particularly in context of the greater plot points surrounding Aang, Zuko, and the shape of the new world. It's a childish B-plot in the middle of a story that's addressing more complex issues, and I'm not sure how to respond to it. 
 Then again, it *is* a kid's comic. (hide spoiler)]