I stayed at the Vdara while I was recently in Vegas. They have one bar in the lobby and given, it's packed. It was a bit "rowdy" when I came down for a drink but when I did finally get noticed by Brandie she helped me right away. That girl works magic making drinks and is so incredibly nice and calm I couldn't be upset with her. Heck, this hotel itself can't get me upset.
Drinks here are inventive, strong, and delicious. I did order some sliders which arrived kinda late but again, it was packed and lots of people were watching the baseball game. The sliders were so yummy and came with some fries. I enjoyed every bite of it alongside my cocktails.
Bonus was that they had an outdoor seating area which has a serene feel to it with a little moat like water around it, some swinging beds, and comfy seats that can make anyone fall asleep. It may be a bit hard to get a drink though since servers are overwhelemed when things get busy. Sitting right at the bar is the way to go.