Is Duke Nuke'm Forever really a bad game?
As with so many things, it's subjective. Are Apple MacBook Pros expensive? Does Retina look better on an iPad? Does the PS3 having more exclusives make it better? Does crap stink?
The last one is the question you're posing in a more generic way. For DNF, it is crap. Does it stink? That's up to your olfactory sense. Keep in mind, though, that DNF is not your own brand. It is someone else's crap, crapped twice, then set aside on a shelf somewhere. After a few years, a completely different group comes along, takes the years old crap, consumes it, and then craps THAT out for the last time with a few modern niceties like saffron and poppy seeds.
Does that thrice-crapped crap stink?