Asian MMA fighter here to weigh in...
First off, though I'm not remotely offended by OP, Osmium is right that there is some racism involved here. He even dropped a definition as evidence. Not all racism is as blatantly malicious as "____ people are superior and _____ people are inferior."
Anyways, whatever, we're all a little bit racist. Moving on...
I agree that Asian MMA fighters have been largely lackluster. I honestly believe that it is a cultural thing more than a genetic thing. As others have mentioned, Asians (in Asia) are at a disadvantage in terms of technology. No, not like PS3 and shit -- I'm talking about training methodologies, weight cutting, etc. They don't have wrestling over there, they don't employ the cage as much, their striking is at a considerably lower level, and athletic training isn't taken as seriously.
In Japan, a lot of big fighters still have full-time jobs. They're not even training full-time, as a big-league MMA fighter in most other places would.
And did I mention the thing about wrestling and cage work? Seriously, that ish is important, and since they don't have an abundance of either of those things, a fighter could work his way up to the top of the local heap without being skilled at either of the SUPER IMPORTANT aforementioned skill sets. That's a recipe for mediocrity, if I ever saw one.
To make matters worse, for whatever reason, the level of striking from Asian MMA fighters is pretty low. It's ironic since K1 is a big thing over there. I have no idea how that happened. In any case, it certainly is a factor. I honestly don't think that Asians have inherently weak chins, but I do think that their inferior striking contributes to their tendency to get KO'd.
(PS: the exception to this are Southeast Asians in Muay Thai, Pradal Serey, etc. They've got great striking and can take a shot. But we -- the lighter skinned Asians -- don't like to talk about them or acknowledge their barbaric existence, so they don't count.*)
I think that it's (eventually) going to be American Asians that end up bringing honor to us yellow skins. I'm still holding out hope for Andy Wang's return to the octagon.
* See? We're all a liiiitle bit racist.
Highly opinionated but out of touch with the current MMA scene.
Support my FB athlete page!
Watch my 7th pro fight here
Watch my "Bare Knuckle" Boxing match here