Ratings are out of a possible five bulbs of garlic.

Bill Compton, True Blood. While he's rather morose and generally humorless, at least he has fangs and doesn't glitter in the sunlight.
Rating: Three garlic bulbs

Claudia, Interview With The Vampire.
Forget Tom Cruise and Brad Pitt: The creepiest bloodsucker in the adaptation of the Anne Rice book was Kirsten Dunst's child monster, all curly hair and demon thoughts. Remember when she brought home the twins for Lestat, and they were poisoned? Evil!
Rating: Three garlic bulbs

Eli, Let The Right One In. You want awkward tweenage love story? You want blood? This Swedish art film delivers, beautifully. Eli is the mysterious girl-next-door; Oskar's a bullied kid who could use someone in his corner. This large-eyed little vamp is simultaneously sweet and unsettlingly menacing. (Check out the trailer here.)
Rating: Four garlic bulbs

David, The Lost Boys. Keifer Sutherland makes it look so cool. He's got chicks, a posse, and a cave hangout. He may or may not make you eat worms and drink blood — but that's the price you pay for hanging with the right crowd! Look, that's Bill, from Bill & Ted's Excellent Adventure on the far right! See how connected these vamps are?
Rating: Five garlic bulbs

Blade. So maybe he's half vampire. But Wesley Snipes was a badass VOC (that's vampire of color) with a Buddhist outlook, sharp weapons and the advantage of being a daywalker.
Rating: Three garlic bulbs

Selene, Underworld. Since she and her vamp vicious circle were so busy hunting werewolves, they weren't much of a threat to humans, and therefore not very scary. Kick ass and gorgeous, but not scary.
Rating: Two garlic bulbs

Spike, Buffy The Vampire Slayer. Many BTVS fans worshipped Angel, Buffy's brooding first love, but Spike, the devilish, quippy, smart-ass, black nail polish-wearing vamp who once said, "I may be love's bitch, but at least I'm man enough to admit it," was actually the better character. Part Billy Idol, part Bowie, part rabid dog, Spike's cuckoo mate, Drusilla, once asked him, "Do you love my insides? The parts you can’t see?" Answered Spike: "Eyeballs to entrails, my sweet!" This is how a vampire thinks: He loves you so much he may dine on you. We never quiet get that from Edward Cullen.
Rating: Four garlic bulbs

Special mentions: Laddie from The Lost Boys, The Count, Dracula, and, of course, Blacula.
Update/Addendum:

Box Office Report: 'Twilight' Sinks Its Teeth Into A Blockbuster Debut [EW]
Why Do We Love Vampires? [iVillage]
Earlier: Twilight At Midnight: Smells Like Teen Spirit
I Was A Teenage Trend-Hater: Despising Twilight Is Big For Fall
Twilight: "Questionable Casting, Wooden Acting, Laughable Dialogue And Truly Awful Makeup"
Breaking Dawn: What To Expect When You're Expecting... A Vampire

[Lots of spoilers follow.] First there's heroine Bella's willingness to marry her vampire lover Edward, even though it means becoming a vampire, leaving behind her family, and sacrificing any hope of a normal life. Then there's her pregnancy. She conceives during the honeymoon, and although she's never wanted a child before, she immediately falls totally in love with the green-eyed baby boy she's sure she's carrying. "I wanted him like I wanted air to breathe," Meyer writes, "Not a choice — a necessity."

This creepy antiabortion allegory quickly gets literal, as the half-vampire fetus (actually an interesting metaphor for any pregnancy) starts killing Bella from the inside out. Even as it breaks her ribs and sucked the life from her, she proclaims, "I won't kill him." But does she have to face the consequences of this choice? No, because vampire magic suddenly allows mother and father to hear the fetus's thoughts, and to discover that it already loves them!

Edward telepathically tells it not to hurt its mommy, and while he does end up having to bite it out of Bella's body with his teeth, everything is again fine because he uses more vampire magic to heal her wounds. Because she is now a vampire, Bella is even hotter than she was before pregnancy, and after a short recovery period she's able to have all-night sex sessions with her husband while the extended family takes care of the perfectly behaved, telepathic baby. In the Breaking Dawn universe, teen motherhood just makes your life rad.

All this radness is made possible in part by the idealized relationships all the vampires and werewolves have. Gone for the most part is the sexy rapacity of Dracula; gone is the fine long tradition of gay vampires. These vampires mate for life, and they mate straight. Werewolf love, meanwhile, involves imprinting, which can happen at any age. The werewolf Jacob imprints on Bella's baby — who turns out to be a girl — giving her a "promise ring" when she's only a few months old. Basically these mythical creatures live in a very safe, heteronormative world — and a boring one.

This is actually the book's biggest problem. It's 754 pages long, its heroine's dominant personality trait is low self-esteem, and, as Amazon reviewer Eventide points out, nobody really has to give up anything. Even the tedium of immortality is glossed over — these vampires just keep busy with their hobbies. If I had an eternity to read, I still might never pick up this book again.

Breaking Dawn does seem to be promoting a fundamentally conservative ideology. But then so does The Lion, the Witch, and the Wardrobe, and they will pry that book from my cold, dead, godless fingers. I think ultimately we shouldn't worry too much about what ideas young adult books promulgate. We should worry about whether the books themselves are awesome. Because awesomeness promotes thinking, and thinking promotes becoming the kind of adult we all want more of in the world: the kind who can understand the message of a book — or a movie, or a blog post, or a presidential candidate — and decide for herself whether she agrees.

Breaking Dawn [Amazon]
Big Week For (And Big Reactions To) 'Breaking Dawn' [Publishers Weekly]
All Fangs, No Bite [Guardian]