New York Times has an article on how to enjoy Korean food and culture in New York. It's by and large helpful if you know nothing about Korean things in New York.
The Korean's own opinion is that no Korean food is worth eating in Manhattan. Generally, only young Koreans, either students or recent graduates, live on Manhattan. Therefore, the Korean food on Manhattan caters to that group. There is no Korean food that takes effort to make - only barbecues, hot soups, snacks, and things you eat while you drink alcohol. Most of them are laced with MSG because again, young people don't know enough to make out the difference.
Worse, some Korean restaurant take the guise of some chic fusion restaurant that lures dumb white people into paying $60 for a meal that should not cost more than $10. The Korean cannot possibly despise those restaurants (and their patrons) more. On the other hand, Flushing, N.Y. and Palisades Park, N.J. are more amenable to those who want to get something more authentic.
Got a question or a comment for the Korean? Email away at email@example.com.