The question that haunts Duke is: Why release a game that's trying to emulate an old shooter without going the whole hog and making it actually retro in a meaningful way? This is a game that wants to be old school but can't actually bring itself to be old school. It's modern but not modern, old but not old, fun but also not fun in equal measure. It's a hybrid of all sorts of different motives and approaches, a fact befitting its elongated development cycle.
If you're going to 'go modern', do it. If you're going to 'go retro', do it. Just don't go half-and-half and end up failing to appease fans of both approaches. While DNF is kind-of fun, is playable and can be enjoyed all the way until the end, it's far away from what it should have been.
Oh, and Gearbox: What's with the obsession with tampons? It's just weird.