The film is obviously not a masterpiece, but is far to be bad and unwatchable: taking into account the other films of writer-director Amy Heckerling (Look Who is Talking etc.) it is not expected something worthy of any nomination.
The movie is a light romantic comedy, and unpretentious movie, about two vampires, one older (1840) and other "younger" (1990) who live together and their adventures and romantic conflicts in nowdays New York.
It features an interesting cast with Alicia Silverstone and Krysten Ritter in the lead roles, besides other known actors such as Sigourney Weaver and Malcolm McDowell (Clockwork Orange The - any movie with him to me is worth watching). The performances are of a light-hearted comedy, with a mocking tone.
The film's visual effects are at least basic and do not know whether they were deliberately forced to refer the B horror movies, with hours that they are hilarious...
The story unfolds gradually with a meeting between Krysten and another person who I will not name (spoiler) and this event turns to be the main line of the story until a cute end, typical of those light romantic comedies. The jokes are good and funny, but not hilarious.
Ends up being a good fun to watch with your wife / fiancee / girlfriend, off course, if she likes this genre of movie.