I picked this up to buy on Friday, but then put it down again and bought The Force Unleashed 2 instead pre-owned for £15. Thank God I did, the reviews of DNF have been terrible.
I really enjoyed the original DN3D on the PS1 - the last part was a tribute to classic PS1 games like Tomb Raider, Resident Evil and Wipeout. The new one doesn't interest me though, very few FPS games do these days.
Had a play on DNF at The Gadget Show Live back in April. Have to say I was largely unimpressed and seems most people agree. Should have left well alone.