I enjoyed Duke Nukem forever, Im not going to say it's a great game, it certainly should have been better in every aspect, but I did enjoy it for what it is
I enjoyed much of the gameplay, and was surprised that the first-person platforming was actually solid. There was a decent variety to the gameplay, and the final boss battle was a lot of fun.
That said, I think it was a fascinating glimpse into how much the industry had changed in the ensuing 15 years it spent in development, because you could see the old pieces as well as the new. Duke Nukem was "out-Duked" a few months before release by Bulletstorm, which showed that even dick jokes had evolved in the past fifteen years. Duke's "signature sexism" was
less sexist than turning Samus Aran into a totally useless, crying little girl and damsel in distress (imagine if they did that to Master Chief or Nathan Drake), and ultimately felt tacked on and lazy. I chuckled at a couple of his lines of dialog, but ultimately the game just felt like a relic. A playable, generally solid game, but an unevolved relic none-the-less.
