I'm guessing the "flawed gameplay" is exactly what you think: can't whip all directions, can't move while ducking, and probably the biggest of all, can't change direction mid-jump. It's silly to call those flaws, because despite my love for CV IV, the old gameplay controls made for a lot of strategy and precise button-pressing, which is loads of fun; IV almost entirely eliminates all that, and makes the game a cakewalk that even kindergarteners can finish.
Jorge: I got my Ambassador games early by going to the eShop, going all the way left to the settings, then to Your Downloads, and then I clicked Redownload on all the titles.