I love all the movies and I get what was being done. They all are a whole and tell the same story. The clue to the whole this is that the Oracle gambled based on what she had learned about humans and what motivates their actions and used that to bring about the end of the war.
Yeah, the Oracle and the Architect pretty took everyone else for a bunch of chumps. I didn't care for the whole "chessmaster" angle, especially since it reduced the whole story down to two people representing free will vs. fate.
There would have been no peace at all if not for Smith running amok and giving Neo a bargaining chip with which to secure a truce. There's also no guarantee the machines would keep their word.
But another key to it is two things the Arhitect said. First in Reloaded he commented that Neo was different then his predecessor in how he is connect to humanity. Second in Revolutions he told the Oracle that she took a huge gamble. What did she do this time around that was different then the previous 5 times? What did she do that made Neo different then the others before him? What was the gamble? That is what this was all about.