Everything having to do with the Red Sea Object was, while creepy, very cool and very well thought out...the other two were even creepier to me.
Ben Drowned I haven't gone though in its entirety, but from the periphery I'd say it means little to me since I'm not much of a gamer. Same idea with Candle Cove: very creepy, as is the whole deal with people uploading "episodes" to Youtube and upholding the mythology through the comments, but I never watched TV as a kid so I think it loses some impact as a result.
Slender Man really consistently creeps me out, which is why I avoided much of Marble Hornets and really every other blog or series and created my own take on the concept (inspired mostly by Marble Hornets) featuring a group that fights, with a fair amount of effectiveness, against Slendy and his masked human minions. It takes some of the terror out of the whole thing, but that's the way I prefer it.
edited 15th Feb '11 3:16:02 PM by frog753