Good call Hamister about 64DD being a useless addon. I think we should leave Virtual boy out of those 2 categories because it deserves its own category.
Bad console idea to begin with - Virtual Boy, Sega 32X, Philips CDi
@dgm6780 and ikilledkenny
When it comes to controllers, one mans trash is another mans treasure so I'd leave those out of the equation. I personally dislike the Dpad on a PS2/PS3 controller with a passion but the rest of the controller is amazing.
On the other hand I think the Saturn controller is the best controller ever made for 2D games and I still use it to this day to play street fighter.
Also adding Turbographix and master system to no third party support.