So I just finished the game, and personally.... I really enjoyed the ending.
At the end of games, a lot of people expect the ending to be EPIC, have a lot of explosions, and have epic music, but the Last of Us Ending, when Joel lies to Ellie about the fireflies and that there was no cure.
Wow... I felt it.
Unlike most games, you weren't playing the hero nor the villain... you were playing as someone who truly cared for another individual.
I'm not saying that what Joel did to save Ellie was a good thing, in fact I felt it was done out of pure selfishness. In fact, he may just have screwed humanity over. But at the same time, you wanted him to save her.
And when Ellie asked him to swear to to her, and look her in the eyes, and Joel straight up lied. It felt it...
This was a great ending.
But those were my thoughts on it, what did you guys think about The Last of Us ending?