I'm saying that the style of play and the atmosphere that is created should be your responsibility and players should go with it, and not allow players to ruin your campaing because they just can't tolerate one of their characters turned into a werewolf.
I have met players in the past that treated Ravenloft to be more "goodly" than Forgotten Realms. If you are going to DM a campaing as demanding as Ravenloft, make sure you keep the style of Ravenloft intact. Players who are not mature enough to have their characters put into tough dispositions shouldn't start at all and keep to what they already know best.
I've seen DM's who offer 1st level characters with enough power to kill Strahd for Christ's sake, I've seen DM's offer their player's priest power over the dark powers. If you can't play Ravenloft, read more, understand it more, and then play it.
This is a wonderful world and I think it is for few people (that's the whole reason the campaign is out of the shelves as we speask

You just have to see the general picture and read between the lines of the book of what its all about.