BTW that's why I think it's unfair to call Soviet Union "another fascist power". Soviet has many many problems, but at least its economy plan doesn't include/depend on rob its neighbours.
Ahem...
The Soviets/Bolsheviks since day one(ever since they consolidated their power in Russia-that means before the end of the civil war) attempted to regain the old tzarist borders. In the early 1920s they invaded Poland, Finland, Estonia, Latvia and Lithuania. Just because they lost all of these campaigns that doesn't make their actions more noble.
In the 1930s when Stalin took over he tried again-this time succesfully-to conquer(thats the more fitting word) these countries.
Germany on the other hand had at least a valid reason for annexing nearby Czechia, Austria and western Poland. There were Germans living there and these were historical lands belonging to the German "ethnos"(nation). And more over its economy was not based on robbing neighbors for gods sake. It had a corporatic socialism of sorts. Don't confuse the exploitation of occupied countries in wartime with the actual economic system.
As for the Turks, while skillfull diplomats, their army was in tatters in the 40s. It had remained essentially unchanged since the Asia Minor campaign of 1919-22. If the krauts ever decided to tackle them it would be a walk in the park.
As for the "madman's" choices; While its easy for us to judge with the advantage of hindsight keep in mind that the general staff didn't consider Barbarossa a risk. They actually expected to win having terribly underestimated the commies. The Russians would crumble and the Brits loosing all continental support would accept defeat. As for the land route to Turkey while it is a very valid argument strategically it is not so pollitically. Turkey had declared herself strickly neutral. Contrary to popular oppinion Hitler was not on a world conquering spree-they didn't even want the war to escalate. Any country that the nazis took over they were justified for it. Poland and Czechia, were all in possesion of German lands and ethnic Germans. Yugoslavia had betrayed them and as for Greece well somebody had to save the Italians. Denmark, Austria, Holland etc were part of the Greater Germanic nation. What would be the justification to attack Turkey? While it seems a joke that the "evil axis warmongers" would be sensitive about such "trivialities", they apparently were.
And a last thing; Curt please don't confuse party propaganda for the masses with actuall political decissions; Barbarossa had nothing to do with hating the Slavs. The Soviet union was a major enemy; They were planning to invade the Reich in no later than 1945.
The Aryan races list during the war was expanded to include French, Croats(slavs!!!), Greeks, Bosniaks, etc. depending on which race the Reich wanted to cultivate friendly relations with.