Fallout 1. To me is the game in which characters are more... Human like? They're all so *realistic* in their conversations, the situations, the way they live their lives, react to the world, it's always fascinated me.
Not looking to start any flames really seeing that NV is the most I loved one so please take it lightly but sometimes I felt like every other NPC had a degree in Linguistics, Philosophy and/or Psychology in that game. Not saying that I didn't like it, anyway.
And for a quote, Jacoren's final speech. That was the only time I've cried with a Fallout game, just reading it again gets me tearing, damn.