Admittedly, I only passed through the casino, but this hotel is a sight in and of itself. I previously had no desire in visiting it, but my friends wanted to go to the Shark Reef, which I recommend.
I loved the feel of this hotel. It was classy and modern. To me, it felt as though it was geared towards a younger crowd. The shopping mall certainly seemed to be aimed at a younger demographic. Of course, this is not to say that anyone wouldn't enjoy their time there.
The pool area was gorgeous, with a lazy river.
In the future, I would pick this hotel as my next accommodation choice. I would love to try what seemed to be MANY amazing dining choices!
The only flaw I found with Mandalay Bay is its location. It is one of the last ones on the south end of the Strip, which makes it a bigger chore to peruse the Strip.