Filled it in.
After selecting "I did not play", I got a set of questions along the lines of "do you like shooters with puzzle elements / driving sections", etc.
Clicked Next and that was the end of the survey.
I suspect they're only interested in the opinion of people who played it (and hence probably bought it, or were able to play for free) and not the opinion of people who deliberately DID NOT buy it after reading reviews / seeing footage. Which kinda seems contrary to the point. If you bought it, they probably don't care about it because you bought it. If they could work out why people WEREN'T buying it, though, that would be a million times more useful to them.
I didn't buy it because:
1) It was shite, as the article inferred.
2) It was a dull, wishy-washy FPS with no imagination, specifically:
a) linear. TOO MUCH LINEARITY. By far
b) toilet-humour with nothing to back it up with
c) over-use of violence/sex as the reasoning behind a character / image / scene
d) It looked and, from what I saw, played like a shooter from the pre-Duke era with fancier graphics
e) None of the "good" content that's been leaked of previous iterations of DNF were included.
3) It was expensive
Seriously, the title was nothing more than a cash-in on the name. Want to know why it failed? Go look at other FPS and even the original Duke.
And stop being patronising - you really AREN'T interested in why it failed, hence why your survey doesn't even cover the greater proportion of people who you need to capture.
P.S. Think we'll be buying another sequel even if you fix most of the problems? Think again.