Just finished the game. The battles were really easy the first several chapters and mostly could be won by auto attack. I think this was compounded by the fact that you auto heal after every battle so it doesn't matter how much damage you take at all. In other FF's you still only attack a lot, but have to worry about conserving MP and Potions. However, the battle system picks up a lot at the end and the fights in the last several chapters were really fun. I actually used Hope as my leader for the most part, which made all the battles really intense. He had such low HP that he could be KO'd very easily, and it forced me to use a lot of Paradigm Shifts. However, it was really fun buffing up my party in the most efficient way, and his super attack adds an insane amount to a staggered enemy.
I also really enjoyed the story, which focused much more on character development than the other FF's seemed to. I liked how in the beginning it wasn't just a clear cut save the world situation, but each character had to figure out the path for themselves. But it did get a bit convoluted towards the end, and some of the mechanisms were dubious. The music was also a good improvement over FF12, but not as remarkable as some previous entrants in the series.