Well, to start, the motherfucking megaprojects. The fact that you generate a unique world. MC is somewhat similar to adventure mode in that you wander around; however, Notch explicitly stated he doesn't want skill in.
I haven't played muh of either for a while. Personally, there are things I like about each. The money part is fairly inconsequential to me, but whatever. Minecraft has one major thing DF doesn't. Sure, you can look at Bloodfist in DF, but ASCII just lacks the oomph that you get from a good visualization, which MC really provides. It also, due to being a first person actually real time game, can provide tensssssssSSSS- In DF, you don't ever come into those scenarios where you're just digging along, when oshitwhatsthatnoiseBOOMdead. Minecraft is also less time-demanding for the ordinary gamer.
Lastly, what many people who give the "If Toady charged for DF, he'd be a millionaire" argument fail to realize - or neglect to mention - is that DF is a VERY niche game BECAUSE of the in(s)ane detail and graphics level. It requires so much more thought process than Minecraft.
Just my two cents about why people shouldn't be hating on Minecraft so much. As for the poll bias, go to the Minecraft: Like Infiniminer but in Java and in Alpha topic in Other Games (note: the topic creator hasn't been on the topic recently; the outdated title is a note of that) and ask which game is better.