"A Space Odyssey" is often praised for its groundbreaking visual effects and philosophical themes, but opinions on its narrative coherence vary widely. Critics argue that the film lacks a clear plot, with some viewers finding it dull and confusing, particularly in its depiction of space travel and the enigmatic monoliths. The film's pacing and abstract storytelling style can be challenging for modern audiences accustomed to faster narratives. Many suggest that reading Arthur C. Clarke's novel "2001: A Space Odyssey" provides essential context and clarity that the film does not convey, as it explores deeper themes of human evolution and intelligence. The sequel, "2010," is seen as less impactful, with some readers noting that later books in the series do not maintain the same depth. Overall, while the film is considered a classic for its artistic achievements, its appreciation often depends on individual taste and familiarity with the source material.