To be honest, i got the same joy from playing Duke Nukem 3d when i played through Prey. If you have doubt about how much influence 3drealms had for Prey, see the wiki article on 3drealms: 'The final game released by 3D Realms was Prey, a game released on July 11, 2006 after being stuck in development hell for eleven years. Prey was originally developed internally by 3D Realms, but after several years of delays, the company paid Humanhead Studios to develop the game."
From the very beginning and through the end, Prey just "felt" like Duke Nukem 3d. You could play games on the video game machines within Prey, you could activate stuff like the faucets. There were big boss battles. The creatures were all very unique and interesting. There was tons of humor through-out. I loved how you would find a random radio playing excepts of a 'coast to coast: late nights with Art Bell" where people would call-in to the show talking about things that have been happening in the game. I loved those little touches.
So, personally, I really don't need a DNF when i felt that i got my fill with Prey.