*The Walking Dead game spoilers discussed here*
I just finished this last night. I was actually somewhat underwhelmed by the ending. Like most people, I was expecting it to be more heart-wrenching and for Joel to die. It was a bit anti-climactic I thought, and funnily enough the writer said this is what many people said when they tested the ending. Originally it had a more upbeat ending. I was more affected by the end of TWD where Lee dies, I actually shed a tear or too and it had a big impact on me.
I really liked the writing and artwork in the game. The characters, acting and dialogue were superb. I loved how Joel was such a badass, he didn't mess about (like when torturing those guys to get Eli's whereabouts)!
It was interesting how they also made him somewhat flawed too. He needed someone to live for. Before he had Tess, and before that his brother. With both of them he had to do terrible things to survive and it was the same with Eli. This is the first game where I actually felt sorry for some of the enemies. Like in the beginning you can hear some guy talking about hoping his cousin is OK and then you kill him. Near the end at the cannibal town you can hear some people saying that the leader David had gone crazy and they needed to elect a new leader.
I think at the end Eli knows Joel is lying, but she knows that that shows how much he cares about her that he wants her to stay alive, so she pretends to believe him. It could also be that she sees how he needs her to stay alive, so she agrees to fulfill that role.
Incidentally, I only killed the doctor with the scalpel

. I thought the escape was really well done, how it mirrored what happened with his daughter. I actually thought Eli might die there, especially when the lift doors opened.