I think is simple, most people at launch only have the money to spent in 2 (max 3) games. Without including the Nintendo Land bundle people will go with these choices: SMBU, ZombiU and one other third game. It doesn't help that most launch games are ports but I think there are to many tittles for launch (second in history I believe), regardless of the ports.
I'm taking a wild guess here, but maybe there's a little saturation in the quantity of launch games, thus the reason why the games have sold so little. I could be dead wrong in this though, it just a guess.
Nintendo and PC gamer








