My childlike innocence of the world was lost the day I watched what happened to Kat. That one was a gut punch. Jorge's made me sad, and angry, but Kat's just took the wind out of me, I remember feeling literally numb for a few seconds while my brain processed what just happened.
Bungie did a phenomenal job with the game. It was different, it had it's flaws, but the campaign they stuck the landing 10/10 - pure Halo. Amazing writing, purely for the fans. A good game is fun to play and has a fun story, a great game will stick with you long after you play, and Reach did that for me.