Do you think it was a big mistake to invade the Soviet Union before trying a serious invasion of Great Britain?
well i guess maybe. i would think it would be better to take briten then SU. once britten is out of hiters hair then the allies had a major set back.
The ideology behind the attack on Russia was sort of good... 1. You destroy the country that is your main enemy ( communistic Russia ) 2. By knocking out the USSR the only country that Churchill at the time was counting on in Europe and strong enough to beat Germany would be out of the picture. After the Blitz 1940 trying again invading the Great Britain might not have been politically or propaganda wise a good choice. So Barbarossa could have been the solution , at least according to Hitler.
Actually, invading Soviet Union was the greatest mistake. And if Hitler just waited a bit more and take other countries first, he could easily take Russia later, and I'm afraid, the whole world... But that's only my opinion...