I suppose some would put it down to the "casual" element. Those who don't rush out and buy the games on day 1 but instead hear about it through word of mouth from friends, neighbours etc. I personally believe they are what Nintendo call bridge games, that appeal to eveyone and they are damned near right by the looks of their sales.
DON'T WIN ME CHIBI BUDDY DON'T WIN ME.
ANIMAL CROSSING NEW LEAF FRIEND CODE:- 5129 1175 1029. MESSAGE ME.
ANDY MURRAY:- GRAND SLAM WINNER!
In my opinion the N64 was not just the best console of the 5th gen but, to this day the best console ever created!