Don't be mistaken... ARIA Cafe is not up to par with the Bellagio Cafe even though it's in a newer better building. Yes, it's a beautiful cafe but everything goes south after that.
My buddy ordered a regular burger but he said it was an awful burger, considering its price point (almost $20). He said the burger dripped everywhere and the only saving grace were the french fries!
I ordered the chicken Caesar salad (approx 15-16 dollars). The salad was actually decent, chicken was cooked perfectly for the salad. Unfortunately paying $20 (including tax and gratuity) for a salad is not on my to-do bucket list in Las Vegas.
Service was lacking especially, considering the few tables that were eating there. I saw many service employees just standing idly by doing nothing.
There are plenty of 24 hour eateries on the Las Vegas Strip whose names are not Denny's and they will provide you a better experience than the one I had at ARIA Cafe.