People here have bitched about the price, but c'mon folks: a sushi restaurant on the Strip? Expect to pay higher prices.
After day two of a financial software conference, I wanted comfort food: sushi and/or rice noodles. And comfort food is what I got: Aloha Roll, Rainbow Roll, and Singapore Curry with Shrimp, BBQ Pork, and Rice Noodles.
The rolls were served fast -- and flawlessly. The Singapore Noodles weren't the best I've had, but they served the purpose.
On a final note, this restaurant is located inside the casino, not on or near the promenade where most of the other restaurants and bars at the MGM Grand are located. As such, it might be difficult to find at first.