I've completed this today and i'm really disappointed. 1+2 are miles better than this.
The story didn't conclude either and with the low sales i'm not sure if 4 is going to happen.
I liked the training to higher your endurance/kung-fu though. It was annoying seeing your energy bar get lower when running to places and it stays low if you don't eat food which you need to do if you want to win battles.