I can't really let that go unanswered. I don't think you have actually played EIR, have you?
I actually like MEM myself. And I am in Zsolo's wednesday game right now. But there are fundamental differences in the philosphy of each. MEM pared down the diplomatic system, and I enhanced it in EIR.
My biggest fundamental problem in the MEM diplomatic structure, is it tilts the game toward being a European deal, almost entirely, and so Japan is essentially forced to DOW Soviet Union. This is why:
In order to balance the relative strength of the Soviet Union against the combined strength of its potential enemies, Japan, China, and Germany, the Russian set up must be strong enough to fight all three. Therefore, if Japan does not attack Russia, then Germany certainly risks losing the whole deal inside Russia, since SU can amass most of its force against the Germans, which was balanced to fight three major powers, not one.
Therefore, best play for Japan is to attack Russia at some point.
This therefore means, that the best play for the Allies, is a direct invasion of Europe as soon as possible, either in 1942 and even 1941, and ignoring the Pacific theater, except for delaying the Japanese advance. MEM really has a tendency to follow the same strategic path: Germany attacks Russia, Japan attacks the UK and USA in the Pacific and attacks Russia, Russia gets into trouble, Allies go for early D-day.
The EIR system is designed to limit the possibility that Japan will attack Russia, one, by making China neutral after it is defeated, and so making the Japanese attack against the heartland industrial center much more difficult because they have to march through Siberia, and two, rewarding the Japanese if they succeed in the Pacific, by making China, a potential Axis ally if Barbarossa is going well, while at the same time Japan has secured the Pacific perimeter, more or less.
Because having China on the Axis side is a definite bonus that will tilt the war in Russia definitely against the Allies, USA and UK are encouraged to fight a hard campaign in the Pacific.
This fits much more closely to the real historical geopolitical shape of the conflict, as Japan's real interests were entirely about achieving dominance in Asia, and not simply being the hand maiden to German victory in Europe. The scenario where Japan attacks USSR at the same time as Germany does has always been a favourite counter-factual history thought experiment, but the fact is that there were numerous reasons the Japanese never did it. The two main ones being that capturing Siberia in no way really benefitted them directly, and the fact that it would probably have had little impact on the European war.
The Japanese entered the war on the premise that Russia was a done deal, and that the time was ripe for expansion in the Pacific.
Zsolo's MEM group that I am playing with on Wednesday prohibits the puppet china or the warlords options by a rule, something that simulates a little bit what we have tried to do in EIR.
The two systems are really about two different philosophies. MEM starts in 38, EIR in 36. MEM streamlines diplomacy by doing thing like removing New Zealand and making it part of Australia. The object with EIR is to prevent repetitious game strategy choices by adapting the diplomatic events system to allow for more options. For example, EIR also allow a mini-war between Japan and Russia at Khalkin Ghol. Now we are using a system that allows Germany to decide when it goes to war.
They are really two different animals.