FF12 had a very boring plot, I played it once for one reason only. I have this obsession with killing super bosses that are extremely hard to kill and Yazmat was FF12's ultimate challenge. I fought him head on with no stupid tricks using the arena or saving in between, took me 4 and a half hours to kill the bugger, he has 50 million HP and his physical attack can cause death. He's also VERY fast and you can only deal 6999 damage per hit after you wipe out the first 10 mil, pretty sure it's 10 mil anyway.
On topic though, FF13's battle system was actually a downgraded version of 12 cause' in 12 you can set gambits to prioritize your characters' tasks but could also control all 3 if necessary. 13 was just terrible, you could only control the "leader" and if that character died it didn't matter if the other 2 were alive it was game over. This stupid problem didn't make the game harder more than it took away from the overall game play since summons are pretty useless and only the leader of course can summon. There's even worse things I could say but I've ranted enough, if the game itself got destroyed inside the PS3 rather than the system that would actually be a plus.