Mainstream:
"We have tank units."
Tony Stark:
"We have a Hulk."
Dwarf Fortress:
"We have clowns and Bronze Colossi (which are weak against Fluffy Wamblers)."
Mainstream:
"We give you an airship/easy transport system by near-endgame to wrap up storylines and complete sidequests. Designs are limited to the graphic designer's imagination."
Dwarf Fortress:
"You get to build your own airship(s) whenever the hell you want; however the hell you want (even design the sucker yourself, engineering and everything; it's like your very own lego set), and make up your own storylines and sidequests *while it hangs in the air."
*For the time being. Until transportation, like boats and battering rams, wagons, and so forth, are implemented in DF, and airships are moddable as usable transports as well ([TRANSPORT_FLYING] [ADV_FLYABLE] [FORTRESS_MOBILE] being included in it's potential raw tags).
Mainstream:
New Game, Same World; Same Story
Dwarf Fortress:
New Game, Same History, Same World, Loot your own corpse.
ALT.
New Game, New World, New History, New Story. By your will.
Mainstream:
Improper modding corrupts game data, and renders game unplayable.
Dwarf Fortress:
Improper modding corrupts game data, and renders the game more interesting than usual. Like Ice that sets you on fire, and gems made of eyeballs, and a race of cattle that eat flesh wearing slade leather. Unplayability depends on how long you can tolerate the nonsense.
Mainstream:
Modding is nearly as much heresy as pirating (or more accurately, by their interpretations, stealing) the game.
Dwarf Fortress:
Open to modding. Only the most important parts of the code (basically, everything Toady's working on) are locked out and hard-coded, and with good reason. All that aside, we have Fallout and My Little Pony as fully-featured playable mods, along with mods that flush out more of the game's content in rather creative ways.
Mainstream:
Bugs are a problem and must be squashed ASAP.
[Dwarf Fortress:
Bugs are better regarded as "Unintended Features".
Mainstream:
Having (or modding) kids able to be harmed or killed will get you lynched by the moral guardians.
Dwarf Fortress:
Dwarven Child Care and
Child-B-Q. And it's
actually pretty funny.
Mainstream:
"Mermaids are a fey and fair folk of beauty that adventurers respect the presence of, and lore has been written to revere them as blessed sirens of the seas."
Dwarf Fortress:
"Mermaids are (*cough*were*cough*) a bountiful and profitable folk of valuable beauty that one can farm for them pretty, pearly bones."
(Sorry for being such a monster, but I'm still laughing over that whole
thread.)