Perfectly crafted story. Many of the ppl does not like the way it ended but according to me, its the perfect ending with really justifiable. Walter may be good for his family but not for all and he is notorious in meth business and his greed takes his life finally. So its totally acceptable. Having said that, we really felt when he finally visits his family for one last time. So as per the story, if this had happy ending for walter, it would not be nice.