This place survives because it's one of the few decent Korean restaurants in downtown core. I frequent this place due to its proximity to where I live. Food-wise, any place in Korean town can easily trump Yummy. Their prices have recently increased, they used to be quite affordable. Well, not so much now. Service, like others have noted, is not their strongest point. They always seem to have only 2 servers juggling a lot of tables. There's an older man behind the cash counter who doesn't seem to have a purpose being there. He doesn't cash out people, he doesn't serve tables = he's super useless. The food here is a hit or miss. I like to stick to a couple of favourites every time I eat here: Yuk Gae Jang and their 2 choices BBQ platter. Other things on the menu, I couldn't care less.
You know what annoys me the most about Yummy? They had the nerve to post "Tipping Etiquette" on the front page of their menu (and on the walls) despite their lack of customer service.