I haven't posted much in these forums but I often lurk here because just about anything about this game is pure entertainment. I can watch let's plays of it for hours on end too, while watching people play any other game bores me to tears.
So far I've only had two real reactions about DF. The first is with a friend who grew up pretty computer savvy back in the 90's (we're both in our late 20's), but didn't really have a computer for the past 10-15 years so kinda fell behind a bit. I finally sold him my old laptop, and he'd been catching up with 10 years of computer gaming. Well one day he asked me if I could find him any more games cause he'd beaten Warcraft 3 a total of 4 times now, done everything there is to do in Morrowind, Oblivion, and Fallout 3, ate through Diablo 2, Torchlight, and all of the Fate games.
I chuckled and jokingly said "Well there's Dwarf Fortress, it's a game that can't be beat." He seemed interested as he'd seen me play it a little bit before, but didn't really understand the ramifications. I told him if he was really interested I'd get it for him, as well as some tutorials and some vids, cause the game has a STEEP learning curve...at which point he responded with "Oh, don't worry about that, I'm sure I can just run it and wing it. Learn everything as I go." A few days later I show up with the game, tutorials, and videos on a thumb drive and said "Here you go, I put the tutorials on there anyways, just in case." Now he refuses to play the game because he can't pick it up on the fly, and whenever it comes up in convo he always says "I just can't get into the game." and plays it off like it's a graphical issue, even though he still owns and plays an NES with 100's of games we've all given to him over the years. I still think it's hilarious.
My other story is pretty short in comparison, I have another friend who's not videogame inclined at all. They tend to give him raging headaches. When I was first learning to play myself, he'd actually sit there and watch me play on my laptop for hours almost like he was hypnotized, and this was WAY before I was getting to the !FUN!...Like just figuring out how to set up farms, quantum stockpiles, etc...