"Worsts" lists, while a good source of conversation fodder, are really impossible to compile in a systematic manner. Ask any 100 reasonably informed aviation enthusiasts to name the 10 best WW2 aircraft, and you would probably see a lot of agreement. Ask those same people to name the 10 worst, responses will be all over the map. I think the list on this website is a very bad one, because it mixes together planes that were actually good when designed with planes that were lousy from the start. I think the Me-210 is a reasonable inclusion, as is the Me-163. So is the LaGG-3. I'd also include the He-177, Curtiss Helldiver, and possibly the G4M.