I just had my first cevapi meal here and cannot believe I have been missing this place! I am always on the look out for these places with my Serb husband, so discovering RM was a treat. Cevapi are delicious, and so were the spreads (kajmak and urnebes). I don't think they are trying to compete with places like Southstreet or Hero as it is a Slavic restaurant, but that being said I will take a burger from Royal Meats any day. It's authentic and tasty Serbian grill.
As for the service, which people seem to complain about, it really is a cultural thing. Eastern Euros just don't do the fake pleasantries many of us westerners are used to. If super friendliness is what you're after with your burger, go to Southstreet and revel in having a smiling 19 year old slather guacamole on your whole wheat burger.