The most common criticism is that the show spends roughly 60% to 70% of its runtime on Earth . While these segments explain the scientific principles behind the alien designs (like extremophiles or gravity), many viewers found them to be "filler" that distracted from the promised alien content.
“Its exoplanet segments are a mixed bag; they look great but are a really jarring contrast to the real-life segments.” Decider · Joel Keller Alien Worlds
Sophie Okonedo's narration is frequently cited as a highlight for its "calming and mysterious" tone. User Perspectives The most common criticism is that the show
Reviews for the series are generally mixed, as viewers were often split on its "hybrid" format, which blends high-quality CGI alien sequences with real-world nature documentary footage. Critical Consensus User Perspectives Reviews for the series are generally
Praise for the series often focuses on its ability to spark wonder, while negative reviews highlight unmet expectations for a pure "alien" experience.