I saw this film at the bradford animation festival before it was released on blu-ray and this is what i thought at the time and is still true now.
also if you're worried it wont play on a UK Blu Ray player, it will. it played fine on my PS3.
"That night the first feature was screened- "Mary & Max". It blew my mind, the naive perspective of the child allows the audience to connect with the emotional journey of the films two main characters. Thats the beauty of animation, Mary & Max could handle the themes of mental illness in such a way that it was comic, but not mocking, and powerful, but not preachy. An authentic representation of day to day worries but displayed in the context of an entire lifetime. The narrative cleverly jumps around between the two characters and their pasts through the letters they exchange and the dialogue of each overlaid on the flashbacks. A thing of beauty. Another australian film, from melbourne this time. So many Australian animations, French too."
please watch this, its very very good. dont be fooled by the medium though, this is for adults.