Well, that's not entirely fair. Maybe in the 80's and early-90's it was prudent to say "no" to Korean animation studios. But several notable projects have come out recently which shows that Korean studios are starting to release quality projects.
Well, that's what I meant, during the 80s, on low budgets. They've definately come a long way, though... But so has the entire animation industry. (Hmm.. Who exactly animated GI Joe? They really suck.)
Well, unless you consider North Korean animation...
http://www.robpongi.com/pages/combofrakkINGUSAHI.html