Okay, hyperbole aside - apart from the character models... almost everything.
The environments are horrific.
I said it before, and I'll say it again: If it was released as a budget title, it'd be fine. It wasn't. It isn't.
Meanwhile those who want to lie to themselves will just keep screaming "IT'S DUKE, YOU DON'T UNDERSTAND!!!!" to any naysayers regardless of valid criticism. I loved the original Duke Nukem as much as any PC gamer at the time, but this is a shoddy mess quite literally yanked from the fire at the last minute, polished up a little and shoved out to make a quick, cheeky buck at the expense of a ravenous fanbase.