I'm currently playing through Disgaea 3 on Vita, got to Chapter 3 and am leveling a level 2 martial artist just so I can get BigBang and then plow through the story soloing Mao when I unlock class world.
I'm not a fan of playing for hundreds of hours to battle superbosses, in my mind it sounds awesome. For example I played through FFX and though "Yeah, the sphere grid is going to be awesome to max out all my stats" then I just don't do it XD