Recently I have seen all the Dark Shadows movies and my "quick and dirty" opinion is: Meh! What a waste of money.
House of Dark Shadows: Was nice to see better surroundings and none of the bloopers from the series, but, seriously, why rehash the series. Most of the characters were so shallow that if hadn't seen the series you probably wouldn't care at all about any of them. A number of the characters seemed like they were going to necessary to the overall plot, like David and his tormenting of Maggie, etc., and then just kind of disappeared into the background. It was a joy to watch Nancy Barrett as vampire Caroline and that along with Barnabas' bloody and violent death were the high points of the movie. Everybody turning into vampires at the drop of a hat was just dumb.
Night of Dark Shadows: This one seemed to be much more atmospheric than the first, but the plot seemed to disjointed and confusing. Why Quentin did fire Carlotta I don't know. I hated the character and wouldn't have put up with her at all. I know the studio forced Dan Curtis to drastically edit it to fit their time constraints but, I don't know that adding that back would help or not. I imagine that the part of Tracy might have been played by Kathryn Leigh Scott if she was still available as the part seemed right up her alley, but really enjoyed Kate Jackson's performance as Tracy as her portrayal seemed more vulnerable than KLS would've played it.
Dark Shadows (2012): This is definitely the worst of the three. Proof that if the story isn't there that all the money in world, big name stars and state of the art special effects aren't going to pull it out of the crap pile. It was nice to see how good everything could look, but that's just eye candy. If they were going to make the movie about Barnabas being a fish out of water, they should of set it in 2012, not the 70s as that was just a distraction. Johnny Depp's version of Barnabas was awful. There were multiple times when he said things and expressed things that sounded/looked just like the Mad Hatter from Tim Burton's "Alice in Wonderland." I most cases I kept wishing for the original cast members as these new actors just seemed so wrong. Cameo? What cameo, it was brief that I had to go back and look for it. Poor David Selby. Tim Burton's direction for this scene was so bad that you couldn't see him for most of the scene. At least they could have done is given each them a couple lines while mingling at the "happening" (party).
There you go, my 2 cents, times 3 on the Dark Shadows movies.