Moonraker
I love this movie. Its stupid, its stupid, and its really stupid - but god dammit its so awesome!
It takes every single Bond cliché and injects it with steroids. You have the ultimate Evil Mastermind plot: Poisoning the world and creating a genetically perfect human race. They dont make them like this any more!
And the third act is fantastic. Its James Bond....IN SPACE!! With space-ships that fire lasers, a huge battle between astronauts in the vacuum of space, and a ship directly lifted from '2001: A Space Odyssey'. As a Sci-Fi fan, it does not get any more awesome than this!
And, with the exception of the whole space part - the people who complain about this movie clearly have never seen a James Bond movie. If he can survive falling from a helicopter by landing on a marquee - he can pretty much do anything. The villains are always dumb: explaining their entire evil plan before placing Bond in an elaborate killing process that he will inevitably break out of. If this is your main criticism then I guess you think every single James Bond movie (all 22 of them) suck.
In my opinion, those who call this the worst Bond movie are clearly missing the point....