Ive played the press release only demo on friday and to be honest i thought it was pretty good, the dynamic of the game and the game engine is pretty atmospheric and very film-ish (bad metaphor), however this will sell shed loads and be a success for Naughty dog, if you are a fan of the Uncharted franchise or zombie style movies then you will love this, in parts it reminded me of the NPC style of the games seen in recent games ie - bioshock infinitive. This has convinced me to buy on launch despite me saying previously i wasn't going to bother, there does seems like a few ways to play this game so i think there is a good level of replay-ability about it.
If you have any questions regarding it (bearing in mind ive played the press release only demo) then ill try and answer you