Well ... I feel like they progressed way too quickly to the level of technology they currently have. And it doesn't have as much as the distinctive cultural feel as it aught. It's all the same as we have in our world/on our timeline, but too quickly, and they're only calling it something different instead of it being unique.
I'm also just very nostalgic for the 'old world'. Like when I read the Narnia series; or LotR. In the beginning, it was so fascinating and fantastic, and there were animals, and this epic journey. I didn't want it to change. Then at the end, all was about humans, or the end of the journey? It lost its magic. I detest the last Narnia book. I don't detest this new show, I'm thrilled, but at the same time, feeling quite let down. But it's only natural, it's years later and it can't be the same. It's also quite weird seeing Katara as an older lady.
Honestly, all the (to me) sudden technology was so distracting it's hard to focus on the rest of the story. I'll try to 'dive in' better next episode. Cars, megaphones, cameras, MICROPHONES ... *explodes*