Viewers find 'City of Shadows' a compelling series that beautifully integrates the art and architecture of Gaudí into its narrative, making Barcelona almost a central character. The historical insights and the dynamic between the lead detectives are generally appreciated, though some find the series overly long with unnecessary diversions into personal backstories and excessive scenic indulgence. The acting is praised, but the pacing and some stereotypical elements receive criticism.

👍 Integration of Gaudí's art into the storyline

👎 Some pacing issues and unnecessary plot diversions