Depends on how you play the game. I haven't played Dracthyr yet and I don't thing they had any impact on my experience of the game.
Ultimately, it's pointless to discuss the impact of x or y feature because it all comes down to personnal preferences : personnaly I don't craft and haven't played dracthyr (yet), so those feautres might have not been shiped in DF and my experience would have been the same ; meanwhile I'm very much looking forward to the warband system and delves, as they perfectly aligned to how I play the game. But for someone else, the situation might be a complete opposite, so the impact of each of those features will drastically change if you go look through his personnal perpective of the game.