I loved Drop Bar when it was all white and 70's looking and I love it even more now that it is gothic and dark. What makes it even more special is that they serve hookahs after a certain time. While it can get pretty packed and hard to find a seat, it is worth sticking around for to people watch and have a little puff puff of deliciously flavored tobacco. You can always save yourself the headache and call to reserve a booth but it will cost you, like anything in Vegas.
The music in the earlier hours of the eve can be questionable (I remember wondering why they kept playing Michael Jackson and 80's rap over and over) but it seems from my experience that the music gets better as the night progresses. I also like that they play music videos.
Overall, Drop Bar has a bit of a club feel but in a non-strip hotel so the crowd tends to be more local. Its a great place to start off the night, wind down your night (morning), or just chill here for the evening.