As someone who's read the books through three times and even took one of the character's names, I feel the need to comment.
All of the characters in ASOIAF are terrible people and become less and less likable as the reader gets to know them better. And Jon Snow is a Marty Stu, not Dany, who killed her unborn son, massacred cities, and has an ever-growing god complex. At least the self-insertion character (Tyrion) isn't a Marty Stu, as that would be even more cringeworthy than Jon's chapters. Seriously, he deserts and then, instead of execution, is made lord commander? WTF he should have been killed off.
Also Martin has killed off a total of two POV characters so he doesn't really deserve the reputation of anyone can die. Turtledove killed off a POV and added a POV every book in his alternate civil war timeline, and wrote 10 books in as many years. Meanwhile, Martin adds about 4 POVs for every one killed off, and will probably never finish.