Well, as an old fan, live action is just not cool. Live action based on a cartoon is a very very delicate thing to do, the Scooby Doo (Mystery Begins & its sequel ONLY) & Flintstone directors and producers did a good job, but the rest like Yogi Bear, The Last Airbender, etc.. are all just worst for the money!
The Last Airbender is more towards Book 1, but unfortunately, M. Night don't understand the franchise well enough, without proper fan supports, the whole movie is a total blowout and no good. So don't even think about watching it, it's not worth it despite all the cool special effects. You're going to lose more money and time if you do so.