Not all ARPG's are as shallow, some like Diablo II for instance are far more challenging and complex than most Final Fantasy games, all due to of course deep skill tree for each class and huge amount of diverse equipment among some other elements. Kingdom Hearts: Chain of Memories on GBA is another one, mashing attack button in that game is as counterproductive as it gets. Assembling your deck and using it properly required lot of effort on your part.

Each Final Fantasy had different twist on it's battle system, and while I personally prefer ATB I don't plan on bashing this one as we still don't know shit about it and I feel Square always delivers in that department if nothing else. And just from reading what Andro wrote, plus visiting FF Wiki, this seems far more complex than what Crisis Core and Kingdom Hearts have to offer.

Honestly though, if Square delivers half of things they promised this will be no doubt one of the best FFs out there.