Viewers generally praise 'Once Upon a Time in America' for its intricate storytelling and stunning cinematography, underscored by Ennio Morricone's memorable score. The film's portrayal of lifelong friendships and betrayal resonates deeply with many, making it a classic in the eyes of its admirers. However, some viewers find its length excessive and its pacing slow, which can be taxing. Additionally, the treatment of sensitive topics like violence and misogyny has been criticized, detracting from the overall experience for some.

👍 Intricate storytelling and stunning cinematography.

👎 Excessive length and controversial treatment of sensitive topics.