I think if they'd gotten actors to play Edward and Bella that could act their way at least out of a paper bag, then it might be compelling cinema. But damn. Freaking oak trees.
And as for a CV3 movie...I just don't think there's enough character development in the game itself to warrant a movie. It doesn't seem like whoever would be directing such a film would really care about staying true to the spirit of the series.
Bram Stoker's Dracula from the 90's was a sex sell, at best. I never saw Van Helsing...any good? And the Anne Rice movies were moderately interesting. But Vampire movies tend to be, as far as I've seen, a little ridiculous. No one's really gotten a convincing plot concerning vampires down yet. And to really understand the character of Dracula (or Trevor, or any of them, for that matter), some research into Romanian culture of the time would be necessary, rather than (as I'm expecting) simply rehashing classical vampire movie cliches.
But that's really a good question...what movies about vampires have the best plot/acting/presentation? I'd be interested to know.