I LOVE YOLIES! Every time we go to Las Vegas (3-4 times a year) we go to Yolies.
I honestly think in our current society of "I want what I want, when I want it" makes it harder for Yolies to shine. Yolies shines with its all you can eat sampler menu. Honestly, I think of it as a meat orgy, its amazing. but when someone is accustomed to being handed a menu and being served exactly what they order than ordering a whim of "meat orgy" it makes it harder for them to truly appreciate the awesomeness of a promenade of meat.
The service is always amazing. The coffee tastes like heaven.
Once we went with a party of 12 and the service was still great, even with two vegetarians, though I am not sure why they choose to come with us to a MEAT dinner, they really liked their dinners as well.
Its my all time favorite place to eat, and I look forward to it for months between our trips to Vegas.