From my understanding from those who have played the game through to completion, what I played in demo form last year, what a friend who has a copy thinks of it, and what is said here:
01.) Story is better than the initial slasher hook would let you know.
02.) Something receiving universal praise at this point is the writing and acting, the characters start as cheesy stereotypes and have some cheesy dialogue, but get more serious later and the characters all get more likable as it goes on, and some of the writing, both cheesy and serious, is actually well-written and the characters have a lot of depth.
03.) This game has a more in-depth choice system than any of the games you mentioned. Everything from bigger to smaller choices make a differences, some choices you think are small at the time much later in will suddenly come back to haunt you, the 'big' outcome of choices is that it is possible for every character to live, or every character to die, or some combination of characters to live/die, but lots of other choices outside of life/death, which effects the characters relationships, developments in the story, and other such things.
The choice system is being praised by those playing, the developer claims that there are several different endings to the game, and various variations of each ending, making there literally hundreds of endings, and says there's thousands of different branching possibilities in the game.