After acquiring the rights to develop a Duke Nukem title, Gearbox should've promptly announced that they were cancelling Duke Nukem Forever (citing disjointed development and the like) and announced that they were developing a completely new Duke Nukem title from scratch. And then they should've actually done it. Then I think we would've had a Duke Nukem title of quality.
It's like an author writing a novel, but only giving finishing half of it, and then for the next 10 years spreading it around other authors to try and finish it.
That said, I believe I read that Gearbox are going to be working a new Duke Nukem title. I think it's safe to say that it will be better than DNF, but I also question whether Duke really has a place in this world anymore. Perhaps we should leave some titles back in the 90's where they belong.