Whether or not you like this adaptation, all the praise and criticisms you have, because I know I've got my own. If you're an ATLA fan, you should be over the moon and jumping for joy that this adaptation has been as successful and well-received as it has and have to remember two things:
1. There are many who were expecting or hoping for a 1:1, 'copy and paste,' exact remake of the OG show.
That was NEVER going to happen. For a multitude of reasons. One being the nature of an 8-episode Netflix season where the episodes range from 45-60 minutes (360-480 minutes total) as opposed to a 20-episode cable show where the episodes are 25 minutes (500 minutes total). They don't have the same amount of total run time to work w/ so some things were going to get cut or changed to compensate. That's just how it is. Secondly, there are things that may work or be fair game in a cartoon that don't work as well or just flat-out does not work in live-action and vice-versa. In the OG Kyoshi Island episode, one tame example is Sokka putting on make-up and a dress. Another, bigger example in that very same episode is Aang stripping down to nothing but his underwear to ride the elephant koi. A 12-year-old little boy being almost naked riding on a giant eel - In a cartoon? Sure, why not! That's fair game! In fact, it might be cool! In live action? Uhhhh... For those two reasons, changes, additions, and omissions were inevitable. Some for the worse, some for the better! As long as the heart and soul of the OG show and what makes Avatar, 'Avatar," is still intact, which I absolutely believe it is, then whatever changes, additions, and omissions come can absolutely work. It all comes down to execution.
2. "From a beginner's standpoint!!!"
You'd be surprised how many of fans of the OG show, whether they like this adaptation or not, don't seem to realize this adaptation is meant to appeal to NEW fans and viewers who may be interested in this show as much as it does to OG fans who loved and/or grew up w/ the OG show. Sozin's Comet was 16 YEARS AGO!!! When the OG show first premiered back in 2005, Netflix wasn't even a THING yet!!! A whole new generation has passed since the OG show and a lot of things have changed, including viewing habits and audience tastes. And if you don't adapt or do something to try to bring in that new audience and generation, you run the risk of your IP becoming irrelevant and an obscure product of its time.
Remember what Uncle Iroh said in 'Bitter Work?' "It is important to draw wisdom from many different places. If you take it from only one place, it becomes rigid and stale. Understanding others - the other elements and the other nations - will help you become whole!" That applies here w/ the Netflix show and the franchise as a whole. As much as many of us DEARLY LOVE the OG show - If we insist on stubbornly clinging to it and rejecting & not opening ourselves to any adaptations or new stories that aren't exactly like it or perhaps even change some things here and there, all we're REALLY doing is hindering the growth of the franchise and discouraging newcomers and people outside the fanbase who want to give it a shot. By understanding others, the other forms of media, the other formats, and helping to foster, not hinder, that understanding and growth, the franchise can become whole.
Regardless of how some may feel about the quality or lack thereof of the Netflix show, there is no denying the fact that it is a HUGE success! #1 show on Netflix worldwide and in over 80 countries now for 2 weeks in a row! Massive press and media coverage in many outlets (Gordon Cormier, the actor playing Aang, was even on Jimmy Fallon!) The franchise has never been more popular than it is right now, and it is entirely thanks to the Netflix show! So, Albert Kim and the team behind it clearly must have done SOMETHING right and have an understanding and respect for the source material, otherwise it wouldn't be as successful as it has become.
And because of its success and because there are so many newcomers and new fans out there who enjoy it so much, they'll be eager and willing to dive DEEPER into the franchise as a whole, not just the OG show! Korra, the comics, the novels, Avatar Studios' upcoming projects, ALL THINGS Avatar: The Last Airbender!
TL;DR - Regardless of how you feel about the show, whether it's good or bad, if you are an Avatar fan, you should be happy and thankful it exists and that it has been as successful as it has been, because that is ONLY good news for the franchise that now has appeal and a soft spot for millions of people across now MULTIPLE generations - like Star Wars, Harry Potter, Marvel, DC, Nintendo, PlayStation, etc. The better this show does, the more Avatar we are going to get! And Bryke and Avatar Studios need to CAPITALIZE on the massive momentum.