One more thing to add on some of the metaphors being bandied.
I think "skeleton" vs. "fleshed-out person" isn't a fitting discussion.
To begin with, many features of MDF are entirely optional--so the game that one person calls MDF is almost definitely not the game that you call MDF. That's a debate-stopper. (Plus, you can easily introduce wide variety in your Dwarf Fortress games by changing up the world params alone--hell on earth is !fun!).
Furthermore, as many of you have pointed out, what interests one person about DF may not be the same as what interests another person. The major division I'm reading in this thread is between "civ/city sim/builder strategy game" vs. "open-world fantasy simulator and explorer." It is clear that Bay 12 Games cares about both a great deal, but their development approach seems to be holistic at every stage (which is why this game is still in early alpha after a decade). So I don't think it's fair to say that players who prefer the "city builder" aspect will not enjoy the future development of DF.
The last thing I really feel like bringing up is that sometimes, less is more. (An earlier poster said essentially this). I keep most of the MDF races and new features off whenever I generate a new world--not just to stave off bugs, either. I use different combinations each time. Having more than four or five races makes the world seem overloaded. I had a similar feeling back in the day when using StarCraft (original/BW) mods ("StarDraft" etc.)--the more overzealously I changed the game, the less cohesive and "buyable" the game felt. The story no longer mattered and the imaginative fantasy was subservient to steroid-jacked strategy; everyone had a million features "just because." On the other hand, keeping just a few things on at a time, the play doesn't feel that much different from DF despite being more varied. (Though the non-content convenience features are really dear to me--alt+p, alt+shift+t/r/n, and gui/gm-editor (I'm a dirty cheater), I miss you).
I prefer to see MDF as a customization tool for DF. That's not to take any credit away from anyone to whom credit is due--the Adamses, Meph, peterix, Putnam, expwnent, others, are all content creators and I love both tinkering with their products and immersing myself in the variety of games they make possible.
edit: mixed exclusive statements because I spent some time trying to quantify before committing