The Toruk-han from Buffy the Vampire Slayer. An army of Slayers would have lost to them if Spike hadn’t gone nuclear and taken them all out. I give them a 95 because they’re ugly too.
Scorpius, from Farscape. They had initially set up Crais as this insane, unstoppable, implacable foe… And then they bring in a guy so bad that he forces Crais to be a hero by comparison.
They later tried to do the same thing to Scorpius himself, with the Sweaty Cleavage Lady, but I don’t think that one worked out nearly as well.
facehuggers 99.9. sure, momma will rip you to pieces, but baby will impregnate you, and eat you from the inside out. i know this from personal experience in a computer game. /cue sounds of skittering
the invisible monster from Morbius’s id in Forbidden Planet: 90
Sauron?
I don’t consider myself enough of an expert on the Professor’s works to properly grade him, but I’d imagine somewhere in the high 90’s.
Balrog - 94
I mean, a 25 foot tall flame being wielding a firey whip? <Shudder>
Shelob. 97
Sauron, seriously? He’s a giant, floating, firey [del]vag[/del]- er, [del]vul[/del]- er, eyeball in the sky. Oooooooh, scary. He’s significantly less present in the books, as I recall.
I’d give “the writer,” a.k.a. Anthony Burgess, and his cronies in A Clockwork Orange a passing high score, perhaps somewhere in the eighties, for gleeful malice in taking young Alex and locking him in a room with Ludwig Van so that it he wants to snuff it.
…on the other hand, some folks might think it’s young Alex who needs the score…
I would also argue that the Weeping Angels suffer from diminishing returns. “Blink” was creepy as heck but by the time we get to the giant weeping angel in New York and it’s skittering cherub babies, much of the the creepiness is lost.
Let’s see. How about Glory, from Buffy the Vampire Slayer. She’s a ditz, incredibly vain, ludicrously powerful, was essentially undefeatable except in her weakened alternate form, and murderous beyond all rationality. 95.
As long as we’re on Buffy, how about Mayor Wilkins? Affably evil, sold his soul for power, was able to draw many powerful minions to his side, ascended to full demonhood, but ultimately couldn’t defeat Buffy and a bunch of high school students. His ascension lasted about five minutes. 91. Still a great character, though.
Any hoard that can be defeated by a 110 little girl isn’t something to be feared.
That little African doll from Trilogy of Terror - 97
The creepy dead girl in The Ring - 98
The rape ghost from The Entity (1982 version) - 99
Pennywise the Clown - 96
Any film featuring a hand that gets chopped off - which then gains a life of its own, crawling about and strangling people.
Me aged 10 -> Hand = 92
Me aged now -> Hand = 50 (still gives me the heebie-jeebies)
I know you said cinematic monsters but can we please include some video game critters?
If so I’d like to nominate Regenerators from Resident Evil 4. Creepiest, most difficult, scariest monsters ever. I hate, hate hate hate hate them (in a good way). Easily a 100. Scarier than sex with Nancy Grace for all eternity.
Speak for yourself! The Angels creep me out every time I see them! 
(In a good way, though–I love them. :))
And I’m kicking myself for forgetting Pennywise the Clown. <shudder>
Yes the Weeping Angels are scary, but the Silence are even scarier! You turn your back and you forget you ever saw them.
Weeping Angels 95, Silence 98.
the Daleks = 15
Davros = 85
Hannibal Lecter - 87 (10 points deducted from original “Silence of the Lambs” score due to increasingly campy sequels.)
Pale Man (from “Pan’s Labyrinth”) = 110
Oh, good lord. I was trying and failing to think of anything good enough for the thread, and all I can think of is scary-as-hell books. But the Pale Man? Yeah, he’s what Pennywise is afraid of.
Terminators have to be at least in the high 80s. “It can’t be bargained with. It can’t be reasoned with. It doesn’t feel pity, or remorse, or fear. And it absolutely will not stop, ever, until you are dead.”
Oh, I have an entry! Hands of Blue 1 and Hands of Blue 2 from Firefly. Let’s put them around 85-90.
I don’t especially find ravening madmen all that frightening: they’re like beasts, and they’re terrifying, sure. Terminator-types are also not especially frightening to me, more like a traffic accident. But the Hands of Blue types, with their calm businesslike demeanor, give me the willies.
I think there needs to be something to contrast with the horror to set it off. The Pale Man is in such a beautiful setting and moves so gracefully, and is all the more appalling for it, for example.