I was visiting my sister in Charlotte and she wanted to try out MOOYAH. We walked in on a Wednesday around 4:30 and it was dead (we were the only ones there). The atmosphere is very casual, fun and eccentric, with vibrant colors and an area you can watch your food being cooked. I ordered a Morningstar black bean burger on iceberg lettuce (along with other toppings and condiments) and it was pretty big to me, I couldn't finish it. I appreciated that the burger was securely placed inside the lettuce and wasn't sliding everywhere or crumbling apart on my hands. The french fries were ok, lightly salted, no other seasonings on them - looks like some of them had grill marks on them, so not exactly sure how they are cooked. The prices are a little on the higher end (average burger price is greater than $6), but it may be due to the popular location. All in all, it was a good experience.
Pictured also is a mushroom Swiss burger and chili-cheese hotdog.