I managed to actually start the actual running of the campaign of Atlantis: The Second Age this afternoon. Ran a couple of sample combats to start things off, as the players needed to experience the revisions to the combat system a bit. But then actually started the game off, and once I started the game proper, the problems with the rules and game mechanics just disappeared as if they never existed.
Had a good time running the game today. Will blog about the game session when I get a chance this week, though it's going to be one hectic week to be sure.