The power glove was only good for one game, Punch out, and all it did for Punch Out was make it really hard.
Remember the Robot? That sucked too.
Power pad sucked as well, could have been good, but there weren't any good games for it (DDR and Pump proved that Power Pad games could be good, its just that Nintendo never made any good ones.
I find it amazing that nintendo would ship that crap, but they never managed to release the disc drive setup that half the launch titles supported (the save and load menus in Excitebike, Wrecking Crew and others).