I disagree with this statement, Mk.2 was far from balanced. It effectively made HDD useless, high Avoid rate made even the DLC bosses easy, coupling skills broke game balance. With high AP(which can overlap), characters can have multiple actions per turn.
Victory fixed most of that, in doing that though...the TEC stat is the new broken Stat. Noire is the only CPU with Armor Breaker outside of Neptune's V slash SP skill *that is relevant*. Bosses are still too easy with the numerous buffs they received like single turn Break status, HP regain, increased TEC, decreased debuff duration, etc.
In short, Victory does game balance leagues better than Mk2. unfortunately it's plagued by the Scout system that brings item collecting to a crawl...as it's the only way to obtain items needed for ultimate weapons/processors. The Gamedisk system was cool though, the Final Fantasy Disk was hella OP.