Alert - more spoilers! 
I've played this game to death now and despite getting a bit bored in the middle levels of Alpha Labs, the game just took a turn for the worse. (or is that better?
)
The scripted action starts to make sense as you decend into hell and I've never seen a game do it better than this. Prepare yourself for it, you haven't seen anything like this before.
The sound is so amazing, but creepy as, er,
hell - you can hear women and babies screaming etc.
New screenshots below, if you haven't got to hell yet then it's probably best to wait and see it for yourself.
Oh and by the way, whoever said that Doom can't handle large outdoor areas was wrong.
EDIT: Another thing, watch that volume control, I think I very nearly blew my sub at one point - bass just comes out of nowhere.
