As to my own opinion. I liked it very much.
The battle system can be boring at times, it's true, but most of the time it was fast and furious with all the Paradigm shifting. I also NEVER used Auto-Battle. So I had a lot more fun with all the intensity and speed required to get through the battles.
The story was rather interesting. It was a very original mythos. Two worlds intrinsically connected, the smaller one carved out of the bigger one as the deities waged war against each other. Humans being bred for the slaughter and puppeteered by said deities through reversed psychology in order to bring a death that was desired to the one that held everything in place in that smaller world.
I do not agree on the realistic characters part, as it had some moments and situations that were a bit too clichéd, but they were appropriate characters for the time and place they were living in. My favourite was Fang. And it was Fang long before she turned into Ragnarok. An entity born out of despair and hopelessness to bring about the end of the world.
So, forgetable? Absolutely not. And that's not even mentioning the constant threads and discussions on it.
It's a FF game that rests between the old JRPG traditions while making strides into new territory. The result was unsettling and people are having a hard time adjusting. Because it's halfway between the old and the new and because it's such a different beast from the most requested games this gen (eg: FPS).
