You know, only the one group of vampires didn't drink blood in Twilight. A minority of a minority. Sure, they all have the sparkly thing but they also are bloodthirsty, some of them monsters. A major theme in the movies(probably the books, too) is the one "family" overcoming their bloodlust to live amongst humans and also not feed on them. The "Voltorre"(or however it's spelled) in this latest movie are the same vampiric monsters we've all seem before (the end of the scene with them has them luring a group of tourists into their throne room type area to slaughter and feed off of them).
Basically the Twilight vampires are not so far off from regular vampires, it's mostly just the Cullen family that's supposed to redesign(or whatever Meyer's intent was) vampires.
The movies could probably actually be pretty good if the actors weren't so (mostly purposely, from what I can tell) bad. Oh, and if the cinematography was better in some of the scenes. Source material, however, is terrible and always will be. The movies have the advantage of being able to pick and choose/reinterpret scenes so they don't come off as "RAPE IS GOOD!" or "WOMEN SUCKRULE!". (Neonivek brings up a good point that what most of us perceive as misogyny may very well be a poorly-made statement about the strength of women)
If only they had chosen to do some of the creepy stalking stuff better...