Which do you think is Nintendo's most groundbreaking system, and why?

[Manlytears]

NES, hands down.
Saving console market and setting a new standard for gaming. Nothing comes close to what NES did.

I mean, maybe Playstation 2/Xbox 360 can be compared to Nes? But still, we are focusing on Nintendo systems, and NES is king when It comes to "being" groundbreaking system.

Just look at your controller, It still carries NES Dpad.