Yeah, just don't get Cocky!
Even with the Navy destroyed, the Allies can rebuild it with relative ease, by the end of T2 they should be up past full strength (the miracles of a good economy). Don’t do anything unreliable like trying to take Karelia or attacking every possible territory on J1 (believe me, I’ve seen this happen before) it’ll lead to your downfall and further prove the Axis advantage is in the mid-game. But Africa and East Russia is a sure must, even with one transport the Germans can have up to 8 inf, 1 ARM, and whatever Luftwaffe you chose at the end of G2 (looks like I really didn’t need that 2nd transport after all!), making it more than a match for any US Operation Torch (“combined” UK invasion is pointless).