You don’t know anything you stupid teen. James Cameron worked on the technology for 10 years. He even invented his own tech for Avatar that filmmakers are still using today. Undermining his work on reddit takes no effort. Loads of people worked hard to create the Avatar experience and people around the world found it to be beautiful.
The movie didn’t have a big fan base or big pre-release hype. It was projected to flop. It opened to low numbers. It became the highest grossing movie of all time because of word of mouth. Why didn’t any of your 60s 3D movies did great at the Box Office if people found them as beautiful as Avatar?