I pushed on through and won a decisive victory over Skynet in April 1946. Germany actually surrendered in September 1945 but getting Japan to give up proved to be pretty hard! There were three atom bombs dropped on the Home Islands (the third was Osaka) but that was not enough. I invaded Kysuhu and took Nagasaki but Japan basically had an army or corp in every hex so it was impossible to get any further. What finally knocked Japan out was the Russian attack into Manchuria that pushed on through to take Peking and the allies invaded and took Shanghai.
I have some petty quibbles (see below). But the bottom line is that I really (and I do mean REALLY) like this game. If I want a game where the relative airspeed between the P-47 and the Frank matters then I'll play WiTPAE. This game is not a photograph of the war just like Picasso's Guernica is not an accurate representation of the air raid in question. But it sure captures the feeling of being there. You have to fight a global war and you have to make global choices. As the US, do I build another carrier, send money to China, or invest in strat bombing? As England what do I do with my fleet? Can Stalin prevent Japan from declaring war on him when Hitler invades. The island hopping gives you the flavor of invasions and the resources necessary to make it work even though the map can be a bit jarring to the eye at first. I had a lot of fun. I'll try my hand as the Axis next. Skynet is not brilliant, but still pretty challenging and I was very nervous in 1940-1943.
There seemed to be a couple of glitches. First, the allies invaded Italy through the north after Italy declared war on Vichy France. After the allies pushed down to Rome I had anti-fascist partisan attacks in Milan and elsewhere. It seems as if the routine was written to trigger those when the allies get into southern Italy without taking into account that they might be getting to southern Italy by way of the north.

Also, on at least two occasions after Germany/Italy surrendered I got messages that Malta was interfering with N. Africa supply. That makes me wounder if either (a) that message is basically meaningless or (b) if the effect was continuing even after it did not matter anymore.
Also, after Italy and Germany surrendered Finland and Bulgaria kept fighting. Obviously not a big deal, but annoying to have to deal with while trying to pound Japan into submission.
It seemed to be impossible to have any sort of offensive in Burma as British/Indian units were unable to cross the jungle terrain.
I realize that Skynet gives itself advantages but sometimes it was frustrating to lose 5-6 air steps to one German air step when I had better technology. Also, North Africa became a stalemate at the Sinai that lasted several years. I've only played this once, but it seemed too easy for the Germans to push on through once the Africa Corps showed up.
The diplomacy game seemed to not really make much difference. I forgot about it after 1940 as there were no significant movements. The main surprise was that Romania did not enter the war and that hurt the Germans (which from my point of view was a good thing).
I also did not like the Indian army having to do research. It seems a bit too cute and, since India does not have a lot of money it wound up in 1946 with 1940 fighter and bomber technology.
I was also surprised to win a Decisive victory even though it took almost a year longer than the historical finish.
I think it would help in the solitaire mode to have a button where you can have the other side surrender. It basically became a grind in 1946 pounding on Japan so that the war would end when it was pretty obvious that it was all over. Three a bombs and the loss of Kysuhu would probably mean the end but I had to slog through turns until Japan finally threw in the towel.
All in all I had a lot of fun!