Best acted? Maybe. It's hard to tell when it was obviously recorded in a phone booth.
User defined battle system? Sure. But anyone with an ounce of programming background can set the game to play itself with no interaction for 80-90% of the battles. If the game doesn't need you to play it, where is the sense of danger or urgency. "Oh, it's a boss, I should probably pick up the controller."
Ivalice is stunning, to be sure. No one can debate that. Shame they didn't put as much time in dungeon design, beautiful but aggravating.
Ultimately I think FFXII is more akin to Shenmue than anything else. It's a better experience than a game. Of course, in a post NMS world, that saying should probably be updated because at least Shenmue and FFXII were games.