Enough is enough, Part two: One-shot villains

DC recently announced that it will bring back Doomsday—the juggernaut responsible for the death of Superman in the 1990s (don’t worry, he got better)—for a big company wide event later this summer.
I’m not impressed. Doomsday worked the first time simply because a mindless, destructive brute capable of smashing through everyone, even Superman, was something different (and of course, he killed Superman). Reuse him and he’s just one more villain—big, strong and powerful, but a little more mundane than before.
Unfortunately, this happens a lot. If a villain works once, the temptation to reuse him seems to be irresistible. Consider:
•The Wrath. After a cop shoots down his petty hoodlum parents, a small boy vows revenge. As an adult, he’s an infamous assassin, specializing in contract-killing cops. But now he’s ready to retire, as soon as he deals with the man who shot his folks—Commissioner James W. Gordon.
Playing Batman against his evil counterpart works beautifully here, but bringing the Wrath back a few years ago (albeit a second Wrath, not the original was just pointless).
•Pluto. I like Marvel’s Olympian death-god in his first appearance, wherein he schemes to trick Hercules into assuming lordship of the underworld, freeing Pluto to join the other gods on Olympus. Thor shows up and agrees to fight for Hercules (despite having been beaten and humiliated by Herc in their last clash) and the subsequent battle reduces the netherworld to a shambles. Pluto realizes the realm he created means too much to him to see it destroyed, and relinquishes his hold on Hercules.
Nicely done. But since then, Pluto’s never been anything but Generic Evil Deity, which not only spoils the original idea of him embracing his role but—well, he’s generic. You could plug any evil deity in for the same effect.
•Galactus. Okay, they could have used Galactus again, but never on Earth.
At the climax of the original Galactus story, Reed uses the Ultimate Nullifier (secured with the help of the Watcher and the Human Torch) to make Galactus back off. Big G gives his word never to threaten Earth again and the Watcher assures Reed that’s as good as gold.
Only it isn’t. Barely two years later, Galactus is having trouble finding planets to eat so he returns to Earth, explaining that yes, of course he gave his word and it’s unbreakable, but—he’s hungry!
In other words, it’s not unbreakable at all. He’s what’s known as honest when convenient. The idea that he’s “above good and evil” and “doing what he must” is nonsense (of course, vampires could say they only do what they must, but the original Galactus story was clear this was the first time he’d threatened a world with intelligent life; later stories would establish he’d actually eatn hundreds of them). And Reed should totally have used the nullifier because there’s no other way to keep Earth safe (and saving Galactus’ life during John Byrne’s run on FF was really, really stupid).
I can understand the appeal of wanting to use a great villain again. But I wish more writers would resist it.