It's like they took the good parts of Disgaea and kept those (Madcap humor, netherworld setting, general evilness of all the characters involved, main character has a monstrous ego, etc), the best parts of Phantom Brave (gridless combat system, more involving between-battle cutscenes), and added a bunch of other good stuff (Best voice acting so far, summonable buildings as remote spawnpoints, and apparently vehicles can be brought into play too!).

Of course, I'm only partway into the second chapter of the game, so I can't say too much, but I like it so far. Has already surpassed Phantom Brave in my mind, and I'm hoping that it will prove to be more of a game than even Disgaea.