I really like this hotel, as many others have said it is a beautiful property.
I will focus this review on my only complaint which is the lack of Marriott Rewards Elite recognition by the property. I booked this property via Marriott and expected typical Elite treatment: Room Upgrade, Exec Lounge, Free Breakfast, etc... The Cosmopolitan offers none of these amenities to Marriott elite members. The only real benefit to staying here is receiving Marriott Points.
I do like this property but the typical "Marriott Loyalty" does not pull me to this property. For someone that stays 75+ nights per year in Marriott properties, a big reason to continue staying at Marriott properties is the upgrades and perks. I received none here so the next time that I am in Vegas I will likely stay somewhere else.