I'm only a few minutes in, but one thing I'm already noticing from the gameplay: proper ammo types being looted like 9x19mm FMJ (as opposed to "Pistol Ammo" reported from a previous build). Good sign.
EDIT: The visuals are stunning and it's promising how well they've captured (and built upon) the stellar atmosphere of the originals. I love hearing the designers emphasise loneliness, desolation and fear - all essential to the magic of STALKER. I do hate the immersion breaking video game compass at the top. Hopefully it can be turned off.