Its not that good.
The main problem with it is that its basically ....
To put it bluntly its they're trying really hard to nail the sense of crude humor of Duke Nukem. Its only barely meeting the standards. Its everywhere. And its turning me off.
Other than its style its nothing more than a generic shooter. The graphics are adequate and the gameplay is solid but other than that its just plain old killing dudes over and over again with weapons that are basically copy and paste from every other zombie shooter out there.
Also playing the same loop over and over again is NOT classified as good. Even if it does sound epic.
Next on the check list is character design.
Its nothing new, its not fun if you've done it 50 times better. No one's gonna notice if you've got slightly tighter controls or better scripting.
This game is by no means bad, its just average.