While it might not have the modding community of say, a Bethesda game, it is immensely fun modded, too.
Consider trying out the Masterwork DF modpack if you're looking for more out of the game, adds so much too it and it's compatible with a relatively modern version. Not exactly as stable, however.
There's also tilesets if ASCII really just burns your retinas.
I could talk about DF for a long long time, I have way too many stories to share so I'll just stick to the generic "it's a good game"