I've fooled around with 3 guys this year who were all asian. I wasn't disappointed by any of them, the Korean guy I was with was 5.5" or so but pretty thick, 6" chinese guy and the last was 7" or so, very thick. I'm seeing him soon actually, he's moving sadly =/ I don't really believe the stereotype. In NYC a majority of my friends are asian, and a lot of them who are 5.5-6.5" think they're actually small when infact they're average or even a little above in some cases.
So many asian guys are in great shape and work out often, at least around where I live. I think they feel they have something to make up for so they try to have nice bodies. I like that though, I love an energetic guy with a hot body, size doesn't matter to me.