Critics and audiences highlight several recurring themes in their assessments:
Praise for the series often focuses on its ability to spark wonder, while negative reviews highlight unmet expectations for a pure "alien" experience. Alien Worlds
You enjoy speculative biology, have an interest in the "how" and "why" of evolution, or want a visually impressive, relaxing show to watch. Critics and audiences highlight several recurring themes in
The CGI is widely praised for being photo-realistic and imaginative. However, because of the high cost of animation, the show frequently recycles the same 3–5 minutes of footage multiple times per episode, which many reviewers found frustrating. However, because of the high cost of animation,
“Its exoplanet segments are a mixed bag; they look great but are a really jarring contrast to the real-life segments.” Decider · Joel Keller
“A good series with interesting ideas that still doesn’t reach the heights it should. I like it—but once again, I wanted more.” IMDb Quick Verdict
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.