Reviews provided by RottenTomatoes
San Francisco Chronicle:
The monsters are derivative, the attempts at humor are mostly feeble and the story, in the end, lacks a certain je ne sais quoi.
Derivative and aimless filmmaking by directors and 'writers' who know only how to craft eye candy.
Los Angeles Times:
There are moments in Kaena that are absorbing, but too much of the time it simply becomes tedious.
A creamy-colored yet derivative sci-fi fantasy with a few rip-offs so blatant ... that even kiddie fans not yet mentally agile enough to make sense of the loopy plot could pick them out.
If Kaena's alternate universe isn't nearly as fully realized as Fantastic Planet's, the 3-D imagery is often gloriously turbocharged.
The folks who go in for this sort of Asimov-ian blather will probably contort themselves reading allegorical meaning into it all. The folks who don't will drift off to sleep.
New York Daily News:
Feeling for all the world like an extended video game made by teenage boys with no girlfriends and a lot of free time, this sci-fi fantasy doesn't exactly make sense, but it sure looks cool.
New York Times:
Despite several striking images and a high technical polish, this picture is just generic fantasy.
With its hasty computer rendering and thin stew of New Age mysticism, Judeo-Christian messianism, and Dungeons and Dragons geekism, Kaena is better suited to a smaller, more forgiving aspect ratio.