While the Luxor works well as a hotel and a casino, it fails miserably as a place to eat. Their buffet should be avoided all together unless unlimited champagne really means that much to you.
The food selection was extensively American and extensively bland. Reflecting back, there were no memorable dishes at all. It was clear that inferior ingredients were used where possible to keep the overall cost to a minimum. Even the omelet station offered up wounded omelets. Any Embassy Suites in America has this place beat for breakfast. Alas, there is the champagne. Bottomless, but the quality of the champagne is hardly worth the effort. I would have been much happier buying a bottle or two of Veuve and staying in the hotel room with my girlfriend.
Probably the worst buffet in Vegas -- avoid.