I just pulled a G1 barbarossa against an Allied player I really respect (Wheatbeer).
Unlike some of the other ideas in this thread, my intention was to go straight to Moscow and take it on G5 (to think of it another way, paving the way for the infantry/art. stacks in GER and SGER to go HUNG -> EP -> NUk/BEL -> SMO/BRY -> Moscow).
It’s been very interesting. As of now (the game is currently at US3), I’ve got the simulator at an 82% chance of taking Moscow in G5. Whether things play out that way is, of course, to be seen.
Some notable facts:
-my buys have been heavy on infrastructure, air, and tanks. G1 was a minor IC and AB in Romania with 2 bombers landing there following attacks on the Russian front, so as to immediately start strat. bombing Moscow G2. G2 was more bombers and a IC upgrade (I also threw a transport in the Black Sea so as to put the Bulgarian infantry into the Caucasus, but I’m unsure whether I’d do that again). G3 was a pure tank buy, and G4 (if a G5 invasion looks promising) will be complementary tac bombers.
-in order to encumber my plans to put 20 damage on Russia, my opponent passed on infantry buys for more fighters. I believe this was wise, but some may disagree. He has also positioned British planes from the med. and India to reach Moscow for UK4 (I took this into account with the sim).
-my opponent had a horrible roll when trying to clear sz125 of an Axis sub; this kept 10 IPCs out of Russian coffers that would normally be there (unless Germany felt strongly enough to sacrifice navy specifically to null that bonus–possibly a good idea)
To sum it all up: I believe a high pressure G1 Barbarossa is a sound strategy. In my next game, I will use it with an idea to better position other Axis elements to take advantage of the pressure this tactic creates (for instance, leaving India without air begs for a J3 India crush–although bringing the US into the war early presents another variable).
I do not claim it will always result in a G5 Moscow invasion, but it jacks up German income almost immediately, keeps Russia from settling in, and puts a lot of pressure on Britain to come to the rescue.
If anyone is interested in taking the Allies against this, PM me, I’m excited to see if it will continually work.