Dissidia 012 is a pretty good action-RPG. I like maneuvering around the stage with Quickmove or Glide and using Bravery-to-HP attacks, as well as being able to use different characters to battle a tough boss or even just using Character X to battle Character Y. The story was inconsistent though. It ranged from being somewhat good to being downright unpleasant to watch. The Reports, at least, were good - that's how the main story should have been (building a team through character interaction and drawing from past experiences to solve problems, etc.).
I liked certain characters better in this game than in their original game (Garland, The Emperor, Cloud of Darkness, Golbez (I liked him in FFIV as well, so that's saying something!), Warrior of Light, Onion Knight, Kain and Yuna) and some of the characters whose games I never played I grew to like a lot (Laguna, Zidane, Lightning and Prishe). There were some characters I liked less (Cecil, Terra (outside of The Reports), Tidus, Vaan and Jecht (outside of The Reports)). The soundtrack was great (although I found that not every piece of music was remixed - only music from the first three games and Blinded by Light) and the game looks good to play and watch.
All in all, even though the story isn't that good, Dissidia 012 Final Fantasy is an awesome action-RPG worth playing, especially if you're a fan of the series.
Status: Completed Treachery of the Gods and Light to All.