Another problem with the game is that there isn't a girl with small or average boobs. While this might seem like a dumb complaint, I think that small boobs are good because they add variety as well as make bigger breasts more remarkable. Also, sometimes they can look good too.
After all, when everyone has big titties, no one does.
Edit: Well, technically, everyone has big titties, but what I meaning to say is it loses the impact. This is why, in most harems, you have at least one waifu with smaller tits.