If you don't buy the game after having watched this then you are an asshole.
If you have already bought the game then you are an a-okay duder.
Simple as that.
Until Dawn is a great game it's just a shame that nobody is buying it because of let's plays.
The gameplay of this is absolutely horrible. Idiotic QT events include motion based ones that rely too much on sketchy technology and a bullshit save system that requires you to replay the WHOLE GAME if you fuck up some random bullshit.
I enjoy watching games like this, I absolutely hate playing them.