Doesn't Adult Swim mainly consist of comedic animations? Or am I missing something there?
Adult Swim is a mixed bag. You have the more comedic shows like Family Guy, Futurama, and Robot Chicken, and they also air anime series with more adult themes, like Bleach, Trinity Blood, and Death Note. Out of all of those, I only really like Futurama, Robot Chicken, and Death Note (which honestly reminds me a little bit of Dark Shadows, despite having a totally different premise, due to the good writing and acting with occasional slip-ups; I don't think DS ever had a line as bad as "I'll take a potato chip... AND EAT IT!!!" though). Honestly, quite a lot of the stuff on that programming block is tasteless garbage.
I think Dark Shadows does have tremendous potential as an animated series, as a gateway between fans of the original and their kids and grandkids. Give the show intelligent, mature writing that both adults and older children can appreciate, but keep it at a level where kids around 9 or 10 can get into it and have a spooky good time without emotional scarring. Joss Whedon tried to do that with a Buffy animated series, but Fox Kids decided that it would be better to have a wide selection of bad dubs of already mediocre anime shows as their Saturday morning block instead.
God knows it would have saved me at that age; at 9 I thought that Ed, Edd, n' Eddy and Yu-Gi-Oh were the pinnacles of intelligent writing.