I'm VERY hit and miss on the Aria. The upside is that we booked our rooms far out enough in advance and using Hotwire that each of our two rooms were under $100 a night. On the other hand, there were a few things I loved and a few things I didn't love so much...
LOVED:
BEST. BEDS. EVER. I mean.... like, EVER.
Their casino floor is awesome. It's pretty big and spread out, so you don't get the slot machines all up in your face all the time. Doesn't smell like smoke, and doesn't smell like obnoxious carpet cleaner, either (I'm talking to you, Treasure Island).
Free tram between Monte Carlo - Aria - Vdara - Bellagio.
Room was modernized -- everything was controllable by a button on a wall, a touchpad, or the TV.
Pools. They have lots of them, and lots of seating all around.
DIDN'T LOVE SO MUCH:
Just walking from your hotel room to the parking garage could easily take 10 minutes. The hotel floors are so wide and long, you feel like you're walking forever just to get to the elevator bank, then you have to walk to the other side of the casino floor just to get to the parking entrance. A bit frustating, if all you want to do is get something from or put something in your car.
In the same vein, just walking from your room to a restaurant at the Cosmopolitan took FOREVER, even though the hotels are almost right next door to each other. It just felt like Aria was tucked away, really hard to access from other parts on the strip.
Bathtub & shower combo. I get it, it's practical. Just felt weird to take a bath enclosed in a shower. Hmmmmm.
The closet doors slam shut pretty loudly because they are heavily magnetized. Didn't want to hear that at 4am from other rooms.
Other than that, would visit again if the price was right, but I wouldn't mind paying a bit extra for a slightly worse room, located in the heart of it all.