Worst ever? I'd have to go with Drax, for two reasons. First, he had the same charisma as one of his cucumber sandwiches. No menace at all. Snore.
Second, and perhaps unfairly, I judge him against the book's Drax, who was easily the best of the villains. Great plan, great motivation, decisiveness, intelligence, ruthlessness--I'd love to see a Bond film made from the book, as opposed to the lame Star Wars rip-off we got instead.
Y'see, I disagree totally. Moonraker has a lot of faults (though nowhere near as many as some would have you believe) but Michael Lonsdale's sublime Drax isn't one of them in my book. His deliberate misquoting of Oscar Wilde is worth the price of admission alone.
As for the literary Drax, I agree that he was one of Fleming's greatest creations. But we
have had a version of the book. Dig deep into DAD - yes, the same DAD that everyone bar me seems to despise - and you'll find the literary Drax's plan intact (enemy of Britain changes his face, gets Knighted, produces a weapon ostensibly for the protection of the West, turns said weapon
on the West...)