They can make pretty good food. Too bad they don't always do that. The quality's gone down since the time Angela C was a student ;-) Even I'm a cpl of years removed from actually eating here.
They salt and pepper squid is still quite good, probably their best dish (though the portion is much smaller).
I've also heard the most horror stories in terms of service out of places that I know of. The owner isn't nice, but fortunately, you rarely see him. The lady (the wife?) is a little temperamental but reasonably friendly. The nicer guy (the brother-in-law?) moved to Orient express when they started that branch.
Just a historical sidenote, OK used to be in the uber ghetto spot in Oakland that Korea Garden now occupies.