Candidly, we did not spend too much time in the D, but did pop in because we heard there were vintage slot machines on the second floor. That was a bust, but we did find a piece of the Blarney Stone there, along with $0.01 video poker (a rare find in Vegas). There were also relatively inexpensive table games on the first floor. (Both of these worked well for us, giving the biggest payouts we received while in Vegas.)
The negative is that it felt more smokey than other casinos we visited, perhaps because of the (older?) carpet and low ceilings. This was a big detractor for us, which is why we ended up not staying very long.