Landing a Plane is not like a golf tournament. Every trained and qualified pilot should be expected to safely land the plane. While not a trivial task, and one requiring significant experience and training, it is not so inordinately difficult that only a very few people alive can perform the task.
With Airplane pilots, Crashes are so exceedingly rare, and the backups, both mechanical, human, and training so well designed to prevent them, that the issues associated with a crash are typically systemic, and little to do with an individual.
Also, the korean culturalism developed when the overly formal/seniority centric cockpit of Korean Airlines was identified as a key contributor to a poor safety record with some korean airlines.
I completely agree with the OP that it's absolutely premature to be making any conclusions regarding impact of culture on the Asiana airlines crash, but, the nature of the crash, in great weather, suggests that there will be some systemic failure (Training, Over-reliance on Automation, poor maintenance, overly complex modal-auto-throttle) that turns out to be the cause of it.