Misuzu's death always was the main reason for criticism of this novel and anime, even among its most loyal fans.
Although this has become a motivation for many anime fans, to read the original novel, Gainax Ending in the adaptation is still considered rather controversial and spoiling the overall impression of viewing.
Because of Misuzu's heartbreaking death, many detractors from Air will say that nothing ever happens in the entire series.
Although in truth, its stated in the game and very heavily implied in the anime that the curse is broken, and that Misuzu's reincarnation will get to have the happy life she deserves. It is, however, harder to be happy about an implied Hope Spot when the characters the audience has grown to love still do not get happy endings.
Esoteric Happy Ending: Yukito asks Girl in the sky a second chance for them with Misuzu, after which they both reincarnate and finally walk like children in their new life on the beach and look sadly at the last day of their past life