I got my hands on Until Dawn early (perk of my job, occasionally) and I just beat it. Gonna give an incredibly vague "review" because I'm tired and it's days before you guys will likely be able to play it.
First off: I'm not sure it's worth the price tag; I think it's better priced at about $40. That isn't saying it was a bad experience but it is a short one. It definitely has a lot of replay value, but if you're happy with your initial ending then I don't think you'll want to even replay it.
I didn't buy it and I'm not sure I will until it drops to $40ish so I won't be able to do my replays for a little while.
But this game was really interesting. All of the camera angles imitate a horror movie and it's crammed full of horror tropes. The characters are obviously archetypes with a little room for growth depending on if you keep them alive and how you go about playing them. There was one that no matter what happened with her, I just loathed her, though. Emily is a biiiiiiiiiiiiiitch. Of course, she survives in my game, lol. You absolutely CAN kill everyone or keep them alive. It is really up to you and there is no hero or heroine in this story that lives no matter what. Everyone is honestly up for grabs.
The story definitely starts out as a typical horror movie and continues on that path for... most of the game. But that is by no means a bad thing, it's actually really cool. If you enjoy horror movies, it gives you this immediate sense of what you should and what you shouldn't be doing in order to stay alive. If your instinct is to run or to hide because you've seen a hundred horror movies where the exact same scene plays out, well then trust your instinct because you're probably right. And it's quite rewarding in that sense. I actually am curious about a lot of things I steered clear from because I knew they would get me killed... but they were so intriguing. And then the game throws you a story line curve-ball that's a little hard to swallow but I'm totally fine with it given the games overall theme (which is hard to even know until you get to the end/beat it). And there's this cool little, "break of the fourth wall" where the game asks you what you're scared of to try and shape the story around your fears I believe. Really interesting, albeit somewhat disorienting. It comes together down the road but it's definitely a huge, "wtf" when you're playing.
I only made it through with 4 of the characters (Mike (yay), Emily (such a bitch, oh my god), Ashley, and Chris) so I'm definitely going to be replaying. Probably at least 2 more, 1 to get all of the collectibles I missed and hopefully keep everyone alive in, and 1 where I just do all of the stupid shit so I can answer a lot of my questions.
My best advice to everyone starting is: do NOT diddly up your quick time events for the love of god. The only time I did, I got a character killed. And do NOT diddly up holding your controller still when it prompts you. Again, the only time I did, I got my diddlying favorite character killed. Ugh. This game auto-saves faster than any game before so you're forced to stick with what you do.
I'll elaborate more on how my game went when the game is actually released. I'm so curious what's going to happen for everyone else... All in all, I think this was a good game and worth playing though at what price is up to you. But you should give it a chance.