I've really only got one complaint with the end now that I'm over "it."
As a man who saw his father get cancer and go from a very healthy 190 to 85 pounds in a year, from stage 3 pancreatic cancer, I can say that they had almost all of Walt's makeup well done (and the bigger clothes helped). However, when he lifted his shirt up, all you should've seen was bones, in all directions. If they had even panned up close and cut his face out and put someone else in there that was that skinny it would've been a great "Holy ****, look how bad he is" moment, because that's how it really happens. It's the reason people arguing "that gunshot shouldn't have killed him so fast if at all!" are idiots. He was close to being dead already, a strong fall could've killed him if it was as bad as they were implying, so a gunshot? He was fueled by rage/love/something to make it even as long as he did.
Still, far and away the best show ever.