I've heard nothing but good things about Nekketsu Oyako, and honestly, I don't get it. 
I don't know; the repetitive, slow, and metodical nature of the beat 'em up genre is like the total opposite of fun for me, and this game was no exception. I appreciate the quirky sense of humor, but that alone does not hold a mediocre game together.

Absolutely delightful music, though.