Just tried Grimaldi's at Boca Park in Vegas. Waiter was extremely cool, though we could've done without his encouraging the loud group next to us to be even louder.
Ordered a large pie with garlic and mushrooms. As another reviewer pointed out, the first slice was the best; Grimaldi's really needs to invest in some kind of serving plate that does a better job (or any job) of keeping the pie warm. Pizza was just what you want from a thin-crust style, however incredibly, and I mean INCREDIBLY under-seasoned. Even with the visible garlic on it, we still needed to douse ours with extra garlic powder, cheese, oregano, red pepper flakes and whatever other seasoning we could find. Only then was the seasoning adequate.
My wife and I did finish the whole pie, but the last slices were sadly cold, and my wife pointed out as well that there were bare patches on the pie where there was nothing: no cheese, sauce or toppings. That is a cardinal sin in our opinion.
Had cannoli for dessert, they were quite good.