If you know the basic summary of this episode then what you read here is not a spoiler. Naruto is nearing the climax of the battle against Pain to avenge his late master, Jiraiya who left Naruto with the task of bringing peace to the ninja world. Now while he's grown stronger, this episode shows his reaction to the consequences of his bold act to face Pain alone. Not insulting. Naruto's rage completely overcomes him and his anger allows the Kyūbi's will to overcome him, rampaging viciously on Pain throughout the episode.
Naruto's fight against the all powerful Pain, who just committed the unspeakable before Naruto's eyes, leaves no more arguing of ideals between these two. This episode has stunning visuals, animations and art(despite a few odd moments with the art), it was a classic and destructive battle between a godly figure, and a Godzilla type of monster, though the latter is the hero.in terms of themes, it's a great episode too. Naruto has reached his breaking point in trying to find a way of achieving peace, which is hard in a world of ninjas. He says he'll break the chain of hatred yet succumbs to this chain completely, shown in how he tries to murder someone who he has hatred for after supposedly murdering someone he cares about. Even when winning against Pain, Naruto is still losing against him in terms of philosophy, which can get the viewer thinking about how peace really can be achieved. Some parts of the animations seem a bit Looney Toonish and strange, but this episode was one of the best of the series, around top 10, it falls under the category of a Nuke Episode in Naruto. Stunning action and visuals too(usually) 10/10