I have been to Royal Meats more times than I can count, and every time I have had a pleasant experience. Yeah, the servers aren't super friendly or smiley, but they are pleasant enough and have never been rude to me, so I have no complaints.
Now, I don't particularly enjoy burgers, but for some reason I really like Royal's burgers (Pljeskavice), and I actually like the fact that there isn't a huge assortment of toppings - the toppings you do find are the classic Serbian stuff like Ajvar (roasted pepper spread) and Kajmak ( a type of fatty cream cheese that is absolutely freakin' delicious).
When choosing a burger, you have a choice between the 1/2lb or full lb. I always get the 1/2lb and can barely finish it. You have the option of making your meal a combo with a choice of either regular or Sweet potato fries, or salad. I usually get the Shopska Salad which is traditional Serbian salad of cucumber,tomato,onion and feta. Fresh and yummy. Sometimes I get the sweet potato fries, and they are equally delicious.
My Serbian bf introduced me to this burger joint years ago, and its his favourite place to come for some traditional Serbian Cevapi (ground beef and pork sticks), grilled pork or Pljeskavice . I have liked everything I have tried from here, but I always come back to my 1/2lb burger - its really flavourful and juicy.
This place is definitely worth a try if you are in the area, and craving a fresh and delicious burger or Cevapi.