Spippin is not that bad.
I'd have to disagree here.
IMO... Worst. Hero. Yet.
I can understand some people will find it challenging to build a deck around him, or simply play him.
But to me he is hands down the worst of the worst.
Plain crappy design right there. +3 threat is ridiculous for what he does.
But again, that's IMO.
Fatty is the worst by far.
Look at pippin, low threat, better than average willpower, bad attack and defense, bad hit points, useless ability. Okay he is used in a spirit questing deck (I mostly play multiplayer).
Now look at Fatty, higher threat, worse questing, same attack, better defense (although you won't be defending with him anyway), better hit points. Useless in multiplayer where you need to max out on questing. And in solo who wants to raise threat when you can just quest the snot out of it?