I much preferred super-villains to superheroes as a kid. Super-villains were like the little girl with the curl -- when they were good, they were very, very good, but when they were bad, they were horrid.
Seanbaby writes about one of the stupidest (and most stupid looking) villains of all time, the little-known Clock King. Just check out that hideous costume.
And this great quote: "DC's Who's Who described him bluntly as "An average athlete... He has no special weapons or powers." Think how hilarious the police scanner would be after a Clock King crime: "Attention officers, we have reports of the suspect in the area. He is unarmed and should be considered badly dressed. Apprehending officers are advised to use caution - reports indicate the suspect loves clocks. Repeat: He enjoys clocks very much. Over."
Another great stupid villain is the Rainbow Raider, who apparently turned to a life of crime because he is color-blind. As we all would.