I went in with a bad attitude since I read a lot of negative reviews.. It was pretty good. The service was meh but the huge amount of options, Veggies, meats, sauces were impressive. The frozen meat was a bit surprising but I guess it makes sense rather than having warm raw meat sit out. Who cares if it is authentic based on the name? McDonalds isn't authentic Scottish food.
I have to say, though, the grill guys weren't very friendly, and the server kept calling me honey, so that was annoying.