johnAK:
You must remember that the Chinese divisions in Korea were not only veterans of the guerilla war against the Japanese, but also those of the more "conventional" war against the nationalists that ended in 1949. If you examine the history of the Chinese Civil War, you will learn that the Communist forces displayed a considerable skill in a large scale maneuver warfare, particularly near the end of the conflict. By 1950, many of their elite divisions were veterans of decades long guerilla wafare against the Japanese and over 4 years of conventional one against the Nationalists.
Contrary to your rantings about "media" knowledge, the historical fact is that the Soviet Union supplied North Korea of all its attack aircraft, armor, lorries and artillery (not to mention the PPsh that the motorized infantry were armed with) . These were decisive in the beginning of the Korean War. ROK forces (devoid of any anti-tank weapons) in the western part of Korea were overwhelmed by North Korean air, artillery and armor attacks. In the east, ROK forces actually did pretty well. ROK 6th Division in Chunchon area actually repulsed North Korean attacks and then retreated in good order when the two western divisions were overrun.
The Soviets also captured a HUGE supply of arms when they overran the Japanese Kwantung Army in Manchuria in 1945. This supply had been prepared by the Japanese since the 1930s in preparation for a possible "northern" strategy. This huge cache of arms was passed on to the Chinese when the war ended and equipped a sizable portion of the Chinese "volunteers."
Your two points about the ROK forces are valid: they were mainly trained for anti-partisan warfare (in fact, much of their forces prior to the beginning of the hostilities were engaged in counter-insurgency against communist guerillas in the South) and their officers were mainly Japanese-trained.
However, I take some issues with the statement that ROK forces killed "hundreds of thousands of unarmed civilians." While some civilians were killed during counter-insurgency operations, the number was hardly "hundreds of thousands." That sounds remarkably like communist propaganda.
Furthermore, you should recall that I wrote "better" trained. Meaning, the quality of training of the officers and men in the pre-war army were generally better than those of the middle of the war. Aside from their Japanese experience, they had two years of training from their American advisors. When this army was trapped and destroyed north of Han in 1950, what remained was, well, the remnant. Men were conscripted hastily during the chaotic retreat to the Pusan perimeter. There was hardly any "training" to speak of. Officers were simply "commissioned" (as opposed to those prior to the disaster, many of whom had some battle experience with the Japanese or training from the Americans).
The training, leadership and morale of the ROK forces did not really recover from this calamity until the ending phase of the war when some ROK forces did display discipline and bravery during the battles for the hilltops.
As for "Japanese style, pure lunacy 'Banzai'" attacks, you ought to remember not to characterize an entire military force with what came of desperate forces trapped on islands. The Japanese did not always launch into "lunatic" Banzai charges. Those attacks really came during the desperate (to the Japanese) phase of the Pacific War against the Americans (talk about "media" perception of Japanese military operations!). If you recall, they did not capture the Philippines, Singapore, Hong Kong, the Malaya, Burma and the Dutch East Indies with simple "lunacy" attacks.
Skorzeny