I went to the Nitro Grill in early August at Excalibur during a Monday Nitro. Incredibly, the line to wait was 20 minutes long and once we got inside I found out why. They only had 25% of the wait staff they needed! Although someone brought our drinks and took our order fairly quickly, it was 45 minutes before our food come out. Incredible.
There was some version of a Nitro Girl there that I didn't recognize that took pictures and signed autographs. The food was your basic Chili's/Bennigan's fare kicked up 1-3 dollars. Generally it wasn't bad although my nachos must have been sitting out 10 minutes before they brought them out.
And, ironically, I got an e-mail from a guy that, two weeks before I was there, had the same thing happen to him and his wife as happened to my wife and me on our honeymoon. And the really funny thing is that they did almost the exactsame walk to get there that we did.