I've just completed the game and except the last ~3 parts (including the finale) the campaign was pretty awesome!
Still, almost nothing from the wonderful E3 2001 trailer made it into the final game and that's a really bad thing, because that trailer kicks ass, even today!

Duke Nukem Forever E3 2001 Trailer:
http://www.youtube.com/watch?v=TDlB2P1leRM

"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual

Check out my new game: Pogostuck: Rage With Your Friends