Dr. Evil understood it. If you're just going to pop someone in the head with gun like a common mugger, then you're no better than a common mugger (pass THAT on to Maxwell Lord, OMAC!).
A real villain understands that elaborate death-traps (preferably involving giant props), holding cities for ransom, forcing your enemy to wear an asbestos jackass costume to escape a raging fire ... all these are about style.
Although sharks with laser-beams on their heads is a bit gauche, in my humble opinion.