Motion Capture and the "Uncanny Valley"

Since its technological and artistic breakthrough in the character of Gollum from Lord of the Rings, filmmakers have experimented with the possibilities and limits of the technology, with varying success. From single characters (like King Kong) to whole races and worlds (like Avatar and several Robert Zemekis films), motion capture elicits anything from wonder in the face of its breathtaking realism, to criticisms that overuse of the technology dumps the audience smack dab in the center of "Uncanny Valley." Why does motion capture draw from critics and audiences such polarizing responses? What films use the technology wisely, and which overuse it to the extent of alienating its audience? Look at both the original instances, like Gollum, and more recent instances, such as Alita in Alita: Battle Angel, and analyse how the different instances work and how they avoid or encapsulate "Uncanny Valley" in their films and characters.