Korean McDonalds recently started serving the quarter pounder with cheese and double quarter pounder with cheese. I just had one and it tastes the same as in the US. I went there once before when they first started serving it but they were sold out. I was so pissed.
In the US McDonald's is not my favorite fast food restaurant, but since there are less food options for me here I eat McDonalds much more than I ever did in the US. The menu is about the same. Some Korea only things they have are the bulgogi burger and double bulgogi burger. The bulgogi burger is ok. The double bulgogi burger is not. They put too much sauce on it and its just a saucy sticky mess. So after trying that a few times, the Big Mac (which I had never had once in the US) became my regular meal at McDonalds till now.