I'm getting a major negative vibe towards my questions.
But... but... in your original post, you wrote "I'm playing a bit of devil's advocate here". Devil's advocate means "a person who expresses a contentious opinion in order to provoke debate or test the strength of the opposing arguments" (according to my MacBook's dictionary), so it shouldn't come as that much of a surprise that your post provoked a slightly hostile response!
I'm a D&D Collector, so I bought the Castle Ravenloft game, but I'm afraid that I struggled to get into it, and it has mostly sat on the shelf. That's probably because most of my gaming friends are horribly addicted to the Battlestar Galactica board game, so if we are playing board games, that's usually the first choice, and if we are spending time on D&D, then we'll play a proper game of D&D. When Wrath of Ashardalon arrives though, I'll take another look at both games and give them another try.
In my view, Castle Ravenloft isn't really something you'd want to buy as an accessory for playing normal D&D, except perhaps if you're sure you can put the minis and tiles to good use. However, if you are someone who likes boardgames with some D&D flavor, it might be something you enjoy.