Amazing and thorough survey. Good work Guardian!
One thing that crossed my mind when I saw that people largely voted for the Taken king expansion over the Dark Below expansion: I met a LOT of Guardians out there during the Oryx raid who had never even SEEN the Crota raid, because they never bought that expansion; Because they weren't day-one players and a lot of people came into Destiny right around the Taken King's release.
So keeping that in mind, I think that has a lot to do with the numbers showing preference for the Taken King content - but when you TALK to people, most people seem to dislike the Taken, hate fighting them, find them a pain in the ass in general. I think a lot of people really missed out by not killing Crota. The Crota raid was so effing fun.
Just thinking.
I think you should have asked people to select all the expansions that they own, so we could see the numbers of how many players ever actually even PLAYED the Dark Below. I think you'd find that a large portion never touched it at all.