Hannes Wersén’s review published on Letterboxd:
Finally, I've ticked this of my watchlist after a very long time of wait. Once Upon a Time in America has one of the best storylines that I've ever witnessed. It's filled with lots of emotion that gets braught in a satisfying way. Sadness, adrenaline, joy and anger are just a small list of what you'll feel.
I guess that this also goes without saying. But Ennio Morricone truly is a genius. This might even be his best score.
I'm not entirely sure what the ending means yet. But I might have some theories about it, I think.