Ok... First thing first: I really didn't like
Heroes of Horror.
I bought it in Lucca last month, and after reading it for a while, I found it a quite childish book. It was the idea of "horror" a 13-years-old might have.
I was looking for a chill, they gave me a BOO!
I was looking for Nosferatu, they gave me Freddy vs. Jason.

...
Now, not to say the WHOLE book is to end down a drainage pipe (mine is still busy chocking down
Champions of Darkness 
): I really loved the grey jester, some of the hooks they gave for the DM (the grisly hag with the jester, especially...), and the art is really beautiful...
Just that the book was as far from horror as the Care Bears are.
I'll stick with my basic Ravenloft, thank you.
About the "Dread Necromancer"...
Well, I find it absolutely out of place in a Ravenloft campaign. Ravenloft is not about people going around dressed in bones proclaiming "GHAAAAAA!!! I'M SOOOOO MEAN!!!" and raising an army of undead mices.
I look for a more... MATURE villain.

Or a PC who's not jeopardizing his soul with every breath: every class feature has "Powers Check" written on it.
No DN in my campaign, thank you.
About their powers... Well, I find them, again, childish. Channel negative energy? Already seen. Dread armor? Already seen.
It was the True Necromancer and the Pale Master wrapped in a new (quite unbalanced) class. Bof.
