This Dart, while beautifully done, it just looks like a black blob. None of the Dart's features are accentuated. Except that stupid overly large billboard in the back window.
The owner was there promoting his brand, hence the big decal.
Usually, I don't like murdered-out cars. This Dart looks really mean though. The stance is just right, sounds great, and it actually stands out in a crowd because of how well it's done. But I get what you're saying and for the vast majority of blacked out cars I'd agree with you. It does not have a lot of contrast between the parts like it would if they were a different color, but the body lines of the Dart go very well with the black paint and the contrast of gloss and satin black help keep things interesting.
To each their own! It's not something I'd ever do to my Dart but I can understand why some people like it.