I beat all of the Disgaea games without worrying about the ways I could create the best characters. I was playing to beat the story and then maybe a few end game bosses. In the first game I even managed to beat Baal (level 9999 boss) without bothering to farm item people. The thing I like about Disgaea is that you don't have to farm. It's up to you how far you get in the endgame.