The Cosmopolitan is a nice hotel, i'd stay there again. I found the decor slick and appealing, has kind of a velvet rope appeal without being too clubby feeling.
I had a reasonably high floor room with a decent view. I liked how you can kill all the lights with one switch. The window into the shower stall with a shade plus full wall mirrors opposite the queen beds suggest they are there for one thing....
The pillows and the rest of the bedding was first rate.
Access to good restaurants, Blue Ribbon was my favorite but there are a number of good ones.
One of the plusses is the Cosmo is situated near Aria, so just from a new and updated part of town there is a lot going on there.
I did not check out the pool, except from 40 floors up. Looked good.
I did notice some wear here and there which I was surprised to see in a new property, but then again, it seems like a party hotel so perhaps it take a beating.
The Casino area is small compared to others on the strip.