Eh... it was certainly massively impactful, but the device itself is not revolutionary in any way (the games are another story, e.g. Super Mario Bros).

If the crash hadn't happened and Mattel managed to drop the Intellivision 3, then graphically and aurally it would have been very close to the NES. Hardware wise the NES is just "like what came before, but better".

Even the gamepad was very similar to the Vectrex controller, which had the same shape but used a very small joystick instead of a D-pad. The use of a D-pad on a controller could be considered revolutionary I suppose (though the D-pad itself wasn't invented by Nintendo, they used it best).

But the same could be said of the SNES and the shoulder buttons then, the most revolutionary aspect was the controller.