A note: my PC is a potato, and because of this my experience here was filled with plenty of lag. However, not so much to render it unplayable for me (and therefore unrateable)
Great graphics and interesting combat system. Though I struggled to figure out at first what was actually going on with the turns and actions (now I understand that the spheres are essentially action points, each skill spends a differing amount, and each turn provides allows you to spend more then before)
I found the skill/equipment system to be rather strange, some things didn't make sense to me (some characters couldn't use some sorts of skills, but I was able to 'buy' it for them anyway therefore wasting resources, no indication of this provided) and it felt tedious to find the stuff that was actually available. Not saying it's bad, just that I think there's probably a way to better implement it.
I didn't go very far, got one crystal, entered another world. But the story was simply there, good enough I suppose as an excuse to play, but not compelling (I haven't tried any of the previous titles in the series... so perhaps that may have changed my expectations?)