Super Mario Bros was a pack in for most people who got NES.
So are you saying no? Mario kart has been a pack in, bundle, discounted, and a pretty remarkable game. I wonder if you can still play it online? I never played it. When I had the money I bought Excitebots instead. That was a fun game as well, but a litle flighty in the controls. Way too arcadey for me.
It still has a few more years to push pass Mario. Of course with digital sales I am sure Mario has much, much more! But we do not know them as far as I know.