The buttons and such were loose and inaccurate since we got it. Compared with Nintendo's normal controllers, which were a lot more resilient, then yes, it was not a good controller in my eyes.
Maybe you had a bad one, because mine was great, and I could never go back to the regular controller after using it.
Max - circle pads
The Max's circle pad was just a slider sitting on top of a regular D-pad. Sliding it alone did nothing. You had to press down. It mostly took the friction away from the skin of your thumb. However, the look and feel was certainly an inspiration.
power glove - Wii remote
The power glove (which was so bad) was not Nintendo's. I think Nintendo toyed with another motion sensing controller, though. I remember seeing pictures in Nintendo Power of a kid punching the air in front of an L-shaped doohickey.
Zapper = Wiimote Pointer? The pointer works excellently as a gun and better than the Zapper ever was.
The technology in the Zapper is way too different in my opinion, though there was a gun controller that used similar tech to the Wii Remote available for the PS2, so one might say the quest for a gun controller that worked with non-CRT screens ultimately led to the Wii Remote.