Yeah, "losing is fun" is the MOTTO, but, when telling someone about DF ... you need something that snaps. Has a pop to it. A nice ring and gets the point across.
I submit the following
"The most awesome mod for notepad EVER!"
"If Tolkien threw up alphabet soup."
"What you would get if a ninja, a dinosaur, a pirate, a shark with lasers and Chuck Norris sat down and made a video game out of refrigerator magnets."
The last one isn't exactly snappy or concise, but, I think it gets the point across! Thoughts?