I have only played the first Disgaea for PSP, though I did not get far in it. For me, it was too difficult to complete. However, from what I have played of the game, I enjoyed it. It has a humorous plot with an entertaining cast of characters.
Hands down, Etna is my favorite. She is great :D
Meowth: Just imagine da Boss in his undershirt doin' chores around da house! <3
James: Do I have to picture that? >_>