The critics got it wrong with this one. Brian DaPalma's The Black Dahlia is quite good; easily one of the year's best. I saw it last night and I'm still thinking about it. It's based on a book my James Ellroy, who also wrote L.A. Confidential, another excellent film. Most of you are probably familiar with the Black Dahlia case itself...the movie is not truly about the Black Dahlia, though. It's about two detectives and how the case affects them as they become increasingly obsessed. It's a neo-noir film, so if you've seen Chinatown you should have some idea of what to expect.
I highly recommend it, though I'm sure audience reactions will vary significantly. It's very good.