The Germans had the tactics but not the raw material nor manpower to win World War 2. There is no path for total victory for Germany. Any outcome that is "better" for them is a less devastating loss.
germans nearly put Russia to sleep, had it not been for the weather they likely would have succeeded and if they had consolidated that position then the west would have been in trouble because Hitler would have had supplies, oil and machinery coming from Russia. France had already folded.
the things that went wrong for Germany were;
Britain's Air Force was better than the Germans and had two of the best fighter aircrafts at the time (hawker hurricane, supermarine spitfire) and the english channel could only be safely crossed in the summer so a ground invasion was out of option. The german Luftwaffe couldn't really compete directly with the british air force (which at this point included volunteer dutch, french, polish and american pilots even before the U.S. officially entered the war) so they started bombing british airfields instead, but british fighter production outstripped their losses, so Goering and Hitler decided to bomb cities to hit their morale, which was dumb because they should have kept bombing the airfields but they didn't and that gave the british an opportunity to reorganize their air force, plus, the summer was gone (no option of ground invasion) and the british had built up their defenses. That's when Hitler started to hit them with the U-boats to cut off their supplies, and it was effective for a while but radar technology ramped up around that time and eventually the u-boats started getting picked off. The british were also keeping Rommel tied up in Africa.
So now he's in a deadlock with the British, his generals warned him not to attack the soviets until they had won in the north african front and taken over British possessions in Libya, which would have afforded them the necessary supplies and oil to then conquer soviet union, while at the same time cutting off important supply to Britain, which would have forced London to sue for peace, but he was impatient because the british were keeping him busy for so long and he said the german people wouldn't have be as supportive of an invasion of the soviet union if they stayed in a deadlock with Britain for much longer. That's when he greenlit Operation Barbarossa
Germans themselves didn't anticipate they would have made such hasty progress in the East, this was partially because Stalin got caught by surprise, so german troops advanced faster than they expected and thus their logistics weren't up to par in regards to supplying the troops that were advancing faster than planned this led to them making progress inland but not actually being able to consolidate positions, which lost them the initiative, and gave pockets of soviet resistance a fighting chance despite being pushed back, which prolonged the fight up until winter (the weather again).
so now he's fighting on 3 fronts, Britain in the West, British Commowealth in North Africa, and Soviet Union in the East, and that's without mentioning him having to babysit the Italian.
and guess what's about to happen around the corner? The Japanese are lurking in Pearl Harbor
weather and trash allies stopped the world from greeting each other with
"guten tag" right now
IMO it probably wouldn't have been good for them at all if Japan didn't get humbled by them bombs.
then when the French folded for the German he turned his guns on his allies and blasted away the French navy just to make sure those weapons wouldn't fall on German hands 
. They are basically saying "damn,thats even cold for me
