This is only the fourth episode (of 13, I assume) . . . shit's getting real and you're bailing?
We weren't all lured in by the promise of a slasher series. Some of us came for the comedy - Denise's line in the previews about them being half-naked and the sorts of things that happen to them in situations like that (I looked for the exact quote, couldn't find it) was what sold me on the series.
One of the things I liked most about the first season was that none of the characters we were supposed to really like died. The only remotely emotional deaths were Sam, Earl (just because he knew his friend had killed him), and Caulfield (because he didn't let the loss of his arms get to him, and because of how solemnly Chad reacted). The deaths were, for the most part, part of the humor.
But now they're killing off characters that we like. The humor-horror ratio has been thrown off. It's only natural that some of the people who liked the tone of the first season would be put off by the change.
As for me, I'm still in. For now. If they kill off Sadie, I'm out. And even if she isn't killed off, if Chad is really dead AND the killer gets away with it again I won't be back for a hypothetical third season.