Endless ways to crush your opponents, in this wonderful turn-based strategy RPG.
Good:
More humanoid character classes than both disgaea and phantom brave.
I found the game to be more enjoyable than all of the others including disgaea 2.
There are many more weapon types to choose from than the previously stated. Sample: Katana, Sword, Morning Star, Bazooka, Staff, Axe, Spear, Nunchuck... It just keeps going on. (I would name some other weapons but it would be a spoiler of sorts, high level only things).
You also get people who can use vehicles such as tanks (many different types of tanks (as stated before I would name a ton of vehicles but its a spoiler)).
Great replay value.
Bad:
Sometimes it can be extremely hard, especially with some battles after you beat the game.
The music in some places can get annoying.
Some of the creatures make extremely irritating sounds.
It can be confusing how the game mechanics work without looking it up on a fansite.
Not much else, I find it all quite enjoyable. The story is slightly weaker than the other games though.
End result:
If your a fan of turn-based games, especially RPGs, you won't find anything better that I know of.