Me and a friend just got this and are about halfway through the campaign book. We are both newcomers and had never played before and have an extension strategy game past.
That said, it seems a lot harder for the Germans to win than the Americans, who have yet to lose a scenario. The closest was the "take the bunker on the hill" one (Charge the guns?), where the Americans took the bunker just as German reinforcements showed up (would have been close if it went another turn).
So far it seems like the American attackers always have the advantage, at least with first time players. The attacker can afford to simply grind his way forward with superior numbers, while the defender has to know what they're doing with their setup.
Some of them I don't even know how the Germans are supposed to win. Take crossroads. Sure the Tiger is a nasty tank, but no way can one of them and 3 PzIVs take on 12 shermans, even on defense with op fire. Even being VERY generous saying that each PzIV takes out 2 shermans, and the Tiger takes out 2 before they get into range, that's still 4 shermans against the Tiger. Toast.
Maybe with experienced players there's some sort of overlapping LOS fire the defender could set up, maximizing his range? I dunno, but with 2 new players the defending Germans really seem at a disadvantage.