While I imagine this was partially in jest, I would recommend that a DM consider what his players enjoy when deciding what to run as a game. It is okay to introduce players and let them sample something and decide that it's not going to be right for you and the player's. It is also okay to ask the players for their feedback on what type of game they want to run. D&D is a role playing game. The players play a role in a story. The DM and the player's write that story together. It should be a story that all of the parties contributing to it are happy to build.
I mock because you don't really have to pitch to players, you pitch to DMs. DMs will generally run what excites them. And there's generally not so many DMs that players can be picky about the setting. The DM is the one doing the work, they chose the game and setting.
If the players want to run something and the DM isn't interested, it's going to be terrible, because the DM won't be enjoying things. Their apathy will come across in the adventure. And even if they are trying, if it's not their interest, they're not going to think of as appropriate of stories. Conversely, even if the players aren't super interested in the setting or type of campaign, a passionate DM with stories they're really excited about will still make for a fun experience, as the DM's enthusiasm will be more contagious.
Now, a *good* DM will poll their players and find a type of campaign and story arc that interests the most people at the table.
For Ravenloft, that would be fans of horror. If the table likes horror then Ravenloft is a good bet.
At its core, Ravenloft is a fantasy world where the predominant monsters in the world come from classic horror films and fiction rather than mythology. It's a world where rather this fighting a dragon, a giant, or a chimera you face a werewolf, a vampire, or a mummy.
