There are some things that are super good at Momofuku (their pork belly is super tender and fatty and tasty), but their ramen is a little disappointing for the cost. In general, items on the menu are expensive (dinner entrees range from $30-60+).
If you haven't tried their pork belly bao and like pork belly, it is worth a try. It is a pretty big bao but is a bit expensive at $7. The pork belly is a thick long slab of tender fatty meat, and the combination with hoisin sauce is really delicious.
Their pork belly ramen ($18) is only available with shoyu broth, which is okay but didn't stand out (I was disappointed that tonkatsu broth was not available). They do include a very soft boiled egg which is nice.
Overall the food was pretty good (probably the best pork belly I've had in ramen), but not good enough to justify the price.