I haven't played this KOTOR 2 you speak so highly of.
But so far I think the game with the best storytelling EVARRR was Portal. It was the only time I ever got scared of something in a game that wasn't just something popping out of the shadows. The story was told through the exploring. I walked into rooms to see chairs knocked over, and nobody told me why they were knocked over. I just knew something happened in there. Was there a fight? The projector was still showing slides. Did something go wrong during a meeting in there? I laughed at the jokes. I got scared when I was supposed to. I think Portal did comedy/horror better than any comedy/horror film ever made. It's very hard for films to be scary and funny at the same time, but I really felt like Portal was.
But I don't think I've ever felt agency or responsibility in a game. I've never been that immersed.












