Exactly. I expected more from the ending, if not total closure then at least satisfaction. I couldn't believe it when it happened. I wasn't angry, though. Like you, I just felt like everything had just been instantly undone - more helpless than anything. For the first game, I was able to at least make up a fulfilling storyline in my head to keep me sated, but not for this. I felt it when I listened to the fates of my comrades, too - I felt like this was some sort of abandonment, and that's why I felt empty.
Yeesh. I can't believe a damn game can do this to me - all I know is that I don't want to see it end this way.
I'll live if it does, though. But this is just too depressing. Argh!