This restaurant is either very very good or very very bad, I've had no in betweens, which is sort of bizarre, but true. Overall, though, the good has massively outweighed the bad.
We tend to get the bulgogi which (as stated) is either amazing or tough/old. I almost always get a sushi roll or two, as well - and they tend to be better/fresher than you would expect given that the restaurant is nearly always half dead.
One warning? If you walk in and it's ridiculously busy? Turn around and walk away - you won't have a good experience, they cannot deal with more than a few customers adequately.