The following review is my personal experience of visiting the Aria as a walk-in, not an overnight guest. I was killing time checking out the strip and doing some people watching while my sister was seeing a show at the Bellagio.
Pros:
+ They have a really pleasant scent they spray in the front lobby area, makes for a nice aromatic first impression
+ The massive waterfall fountains on the exterior are a great place to take pictures
Cons:
- One of the cocktail girls was quite curt in responding to a request for where the men's room/drinking fountain was (my mouth felt parched from all the smokers, seems she was only interested if you wanted to buy hard booze?)
- The layout of the Aria is very confusing, and is more or less like a maze, both on the inside of the building and out
In summary, my short visit to the Aria was underwhelming, but given I didn't stay long, nor as an overnight guest, I'll give it a passable three stars. Perhaps if a future stay in Vegas permits, they'll be able to wow me better.