My husband and I stopped by for a cocktail on St Patrick's Day one late afternoon. The ambience was really "cosmopolitan" and the decor was really spectacular. Three levels of layers and layers of beautiful lights and chandelier. I love how much attention to detail places like The Cosmopolitan puts into their casinos and venues.
The bar is centrally located within the casino so most places that you sit has sort of a wide open patio feel, yet you're indoors. It makes for good people watching if you're into that or for a sophisticated lounge spot for you and your companion(s).
We liked that they had luxurious couches and chairs for customers to sit on. (Although not sure how many people sweated and spilled drinks and other bodily fluids on them so I wasn't inclined to kick my legs up and relax. Lol!).
All in all, we liked the place and the cocktails.