The director's second film was widely criticized for being ________; reviewers did little more than identify its many cinematic antecedents.

While "soporific" suggests that the film was dull or sleep-inducing, this term does not directly address the issue of originality. The criticism focuses on the film's lack of innovation rather than its ability to engage or entertain the audience.

Describing the film as "eccentric" implies that it had unconventional or unusual elements. However, this term does not fit the context of the criticism, which revolves around the film's unoriginality rather than its uniqueness or oddness.

The term "restrained" suggests a controlled or moderate approach to filmmaking. This does not align with the criticism presented, as the reviewers were focused on the film's derivative nature rather than its emotional or stylistic restraint.

"Decorous" refers to being proper or well-mannered, which is unrelated to the film's originality. The criticism emphasizes the film's lack of innovative content, not its adherence to social norms or decorum.