Japan would have lost to the Russians just like they did in 39, but even wose they would not be able to capture any of the raw materials they needed to not be a third world country in 3 years.
Italy would have mismanaged her conquests and arab subjects similiar to the turks so although it may have threaghted baku aswell as allied supplies to Russia is would have not been a big a deal as it would have been under competent leadership that the Italians did not have.
Japan winning a major victory at Midway would have severly hurt American efforts, although it might have down well for american propaganda as they could easly paint it as a defensive battle and could rally more support for the cause. Also since it is a naval battle there would have been less causalties so it would have less of a political factor.
The Germans would have messed up sealion even if they had air supeirority, there are not so many beaches in engalnd and the engalnd would have a sizible force fighting for there homeland and being backed by the US that could bottleneck the Germans on the beaches. Plus they still have naval suppeiority.
Losing D-day would have been devistating, espeacialy if it was a long battle and their were tons of British and American causaulties. I get the sence some Americans were already tired of the war and losing so many men would have just incouraged the anti-war camp. It would have been painted as just another european conflict like WW1.
Or anti war groups might say Japan was the right war and Germany was just a distraction, (to draw a paralel to Afgahnistan and Iraq today, )