Hunter: the Reckoning was spectacularly abysmal. Glad to hear HtV is working out well for folks though. Might look into it sometime, if the local WoD-heads (er, the ones I happen to know, anyhow) come to like it.
What's so dark about Slasher? Apart from [presumably] being about serial killers and the like, obviously.
Well, in part it's the serial killer nature. Remember, this isn't just supernatural Jason-esque serial killers, it covers the lower spectrum too. The fluff in the book is fantastic, if a bit disturbing at times. I'd say what makes it so much darker is 1) It's serial killer through the eyes of a very aware audience, unlike most serial killer movies. Don't get me wrong, it sets itself perfectly to play a Dead Teenagers game, but the emphasis is on human beings bringing out the wanton destruction and death of other human beings. 2) It talks about how to play as a Slasher. 3) it focuses heavily on the theme of hunters who burn out becoming Slashers. Vampires, they look just like humans, don't they? And mages, hell, they ARE people - just ones that effect the world differently. How long until things start to turn black and white? How many mages go down until you start to see patterns that may not even be there - and then innocent people that fit your pattern no longer seem so innocent? There's so many people out there who don't know and don't care about those monsters. Maybe they're the monsters. Or maybe you've just been killing for so long that it's becoming a second nature, deadening your senses.
The opening fluff really does set the stage perfectly. To catch a Slasher, they have to think like one, begin to act like one. But once you've begun harming innocents, even if it was to catch a monster, what does that make you?