I would warn that the first hour is just the same Dracula story we've seen told a million times. It's only in the second half that Eggers lets us in on his particular twist on the material.
Spoiler
(The vampire here is a metaphor for childhood sexual trauma--the bubonic plague of our times.)
I wish he'd spared us the fealty to the source material and gotten his big ideas started a little earlier. Also, that he cut out some of the shrieking.
And why set this movie in Germany, if you're just going to have the cast speak with English accents? Maybe that's a small thing, but it contributes to an uneasy feeling of silliness that haunts the movie. I guess the only reason is to underscore that this is Nosferatu and not Dracula, but that's a stupid reason. At least throw in a few CG shots of the Black Forest (Speaking of which, the CGI backgrounds look a LOT better on the screen than they did in the terrible trailer.)