Why ET game was a failure?

The ET game for the Atari 2600 is considered a failure due to its rushed development and poor execution, which resulted in confusing gameplay and subpar graphics that did not meet player expectations. Released during the 1983 video game crash, it was heavily criticized for its lack of engaging content and difficulty, leading to widespread disappointment among consumers. Additionally, millions of unsold cartridges were famously buried in a landfill, symbolizing the game's disastrous impact on the industry.