It's not perfect. It's no One Piece live action. But you'd really have to watch the show having already decided you're going to hate it to not see the love and attention that have been given to this adaptation. I have a feeling a lot of people saw a single thing they didn't like, and started writing 1-star reviews before even watching the rest of the show.
For example, Reviewers pretending "learning not to be sexist" was Sokka's character progression have completely forgotten the emotional core of the series, and they refuse to see how faithfully that emotional core has been captured in the rest of the show. Sokka's sexism was a symptom of having been left with a heavy responsibility at a young age, while simultaneously feeling he was only left with that responsibility (rather than a greater one) because he was deemed not good enough. The show captured his sense of burden and inadequacy very well within it's 8 episodes, while trimming down some details, such as him being sexist for about two out of twenty episodes (primarily episode 1 and 4) in the original cartoon.