I think it was the "dark and gritty" look that got criticized and put off the fans. After all,
Duke Nukem 3D is more bright and colourful for the most part.
Here's what Brandon Blume a.k.a. Musically Inspired (he has recorded high-quality versions of some old games' soundtracks, including
Duke Nukem 3D, which are available
here)
wrote on the subject:
Quote
I've known about it since its creation. I'm not that excited about it. The goal is to create Duke3D as if it were a modern shooter. Dark, gritty, bland generic atmosphere instead of the bright and colourful look Duke3D was known for. Personally I really don't think the two ideas go together at all. It's somewhat of a controversial subject among the Duke3D community. They've also released nothing but concept artwork and podcasts since it started. It's like there's no proof of anything. They keep promising stuff "soon" and we never see anything. They've been saying a multiplayer demo will be released very soon for months now.
Good luck to them and everything, but I'm not holding my breath that it's going to be anything that great.
Also, here are several threads on the subject at Duke4.net Forums (a large Duke Nukem community website):
Duke Nukem Next Gen (that was the original project title)
Duke Nukem 3D : Reloaded
Duke Nukem Reloaded abandoned?
Whats with all the hate on DN:3D Reloaded?