The Silver Age of Marvel - Villainous Villains!
Outrageous villains were a key staple of early Marvel. Some are so absolutely embarrassing and of their time that it's clear why they haven't survived as modern day adversaries. Iron Man seemed especially doomed to a terrible rogue's gallery. Meanwhile, perhaps due to cheer volume, several rose to the top and have lasted as elemental forces of villainy.
Out of all these drawings, I might be most inclined towards MODOK, whose design is so ridiculously overwrought and is pure Kirby goodness.