i greatly prefered X's timing puzzles as it was fun and had the chance of not working as well as you hoped or working perfectly due to player input, and VII's variety of Limits for each character made it a good system as well... what could have made IX's a better system would be if it were savable like VII, VIII, & X, then it would at least be usable... and yes Limit Systems started with VI, and you could actualy choose how the limit gauges filled for each character in X...