Dany is Mance + Stannis
and Jon’s feelings on both are clear
Mance. Like Dany, Mance is the foreign invader who creates an army of Dothraki-like raiders to attack the realm. Mance also has an oversized image of himself, is a mess of contradictions, and loses sight of the bigger picture.
What Jon thinks of Mance:
Jon thinks he’s nothing more than a charismatic Euron Greyjoy or Drogo, whom he would kill if he had to, to protect his family and his home:
Mance had spent years assembling this vast plodding host, talking to this clan mother and that magnar, winning one village with sweet words and another with a song and a third with the edge of his sword… hammering a hundred different daggers into one great spear, aimed at the heart of the Seven Kingdoms…I will kill him if I must. The prospect gave Jon no joy; there would be no honor in such a killing, and it would mean his own death as well. Yet he could not let the wildlings breach the Wall, to threaten Winterfell and the north…For eight thousand years the men of House Stark had lived and died to protect their people against such ravagers; and reavers … and bastard-born or no, the same blood ran in his veins.
Jon has little respect for Mance’s main “accomplishments” as king:
All Mance ever did was lead an army down upon the realm he once swore to protect.
Mance’s attack on the Wall pisses Jon off. So much that Jon thinks of Mance’s favorite song (about how great freedom tastes) while pouring fire down on him:
Grenn was rolling a second barrel to the precipice by then, and Kegs had one as well….A flaming giant lurched into view, stumbling and rolling on the ground. Then suddenly the mammoths were fleeing, running from the smoke and flames and smashing into those behind them in their terror… When they break, they break hard, Jon Snow thought as he watched them reel away. The drums had all gone silent. How do you like that music, Mance? How do you like the taste of the Dornishman’s wife?”
Jon regrets not killing him when he had the chance:
I should have tried to kill Mance Rayder on the Fist, even if it meant my life. That was what Qhorin Halfhand would have done. But Jon had hesitated, and the chance passed.
Jon believes that his people have bled enough. He understands their daily struggles, while Mance and the wildlings do not:
“This land belongs to the Watch,” Jon said.
Her nostrils flared. “No one lives here.”
“Your raiders drove them off.”
“They were cowards, then. If they wanted the land they should have stayed and fought.”
“Maybe they were tired of fighting. Tired of barring their doors every night and wondering if Rattleshirt or someone like him would break them down to carry off their wives. Tired of having their harvests stolen, and any valuables they might have. It’s easier to move beyond the reach of raiders.” But if the Wall should fail, all the north will lie within the reach of raiders.