Finished it last night. It was amazing, wonderful, fantastic. Nearly the whole way through, I didn't feel quite satisfied, like something was off, or they would leave things unanswered. But then with the last boss fight and the last round of cutscenes, everything was cleared up, tied together, and made nearly perfect. Highly, highly
recommended to all MGS fans.
Also, spoilers are welcome from here on out, scroll no farther if you don't want to know things. Ye be warned.