As a follower of the Duke Nukem franchise for only the last three years (when I first played Duke Nukem 3D), and having played every duke game released prior and after, I have to say Duke Nukem Forever is fantastic.
Graphically, it's not advanced, no. Game-play is far from amazing, sure, sometimes it feels like I'm playing a game from 2001. The story isn't what you come to a Duke game for either, and let's be honest, the humour is dated, only mild enjoyment remains from his jokes.
Yeah, in general, we have a mediocre experience, but when it all comes together, it feels so much more. When you allow yourself to become immersed in the sillyness and absurdity, you'll feel at home again. When it all comes together, it begins to feel like a 7/10 game.
"it doesn't feel like a Duke game"
Why not? The humour is there, the character is there in all his glory. The thing that made Duke 'Duke' is there. Duke Nukem Forever is the same as Duke Nukem Zero Hour, or Manhatten Project. It isn't the same gameplay, but it retains what it needs too, and when you accept the changes, you find an extremely underlying fun experience.
It sure feels like a Duke Nukem Game to me!
Don't judge this game on what you hoped it'd be (the best game ever), judge it on what it is. I definitely consider this to be one of the funnest games I've played of the current 'generation' of games, and a highlight I'll return to in the near future, constantly!
Also; who else had a blast throughout the Duke Burger chapter? I naively didn't shrink the large enemies while I was in shrunk form, leading to an extensively fun battle on the hardest difficulty. The whole kitchen platforming was so fun, too.