Me and my friend John were discussing the final three episodes and I kind of saw the last three episodes like this:
Ozymandias was hell for Walt and essentially him dying a painfully slow death.
Granite State was like purgatory.
Felina was heaven.
This remind me of the old Nocenti run on Daredevil "Heaven is knowing who you are". I guess it fits well "Felina", because Walt finally reached what he searched for so long : he was fully himself for the first time. No more lie.
Mild mannered Walter White died a long time ago, and Heisenberg took his place. But it wasn't that easy, because neither Walter White nor Heisenberg was the true Walter White, like neither Clark Kent nor Superman are the real character.
They are both true and both false, only uncomplete part of a much more complex character.
Mild mannered Walt was the pretention of being a good guy. He had noble goals, but, without Heisenberg strength and determination, he couldn't do anything.
Heisenberg was a ruthless and powerfull guy, who had no problem in crossing line and murder. He could do anything, even the impossible. But, without a goal to reach, he was just a time bomb which runs nowhere. he was just the manifestation of Walt wanting to live and to do "great things" to be remembered.
Heisenberg began to die in Ozymandias.
Felina was Walt finally "living at his true potential", by merging both the Walt and Heisenberg personas.
The strength, determination and genious of Heisenberg, with the goal to make "something right" of Walt.
But the "something right" isn't "something good". Yes, it is part good. He cleaned his wife, saved Jessy and gave the money to his son. But he also threatened his former friends, and finally admit that his best child is his blue meth.
He never searched redemption, he didn't care for such a concept.
Finally, he died but fully won : he was fully himself, living at his true potential, and got them all : the bad guys, the cops, even the cancer (since he killed himself), and his legacy will live, throught Jesse, the new Heisenberg, and throught his drug.
So he could die at peace, being proud of him.
Subtle characterization from one of the most subtle and human serie.