Forget anti-tanks, first. They are far far from being interesting, they lack punch, cost too much in tech to develop and their force pool is too low to justify investing into them. They would need a significant buff in stat (be better than a tank on defense e.g.), lower tech cost, and a force pool almost equivalent to the number of tanks each nation have.
As for your result, I'm not surprised, that's the norm within the parameters you mention. A successful Germany around 1941 will have units with 120% morale and a very very high readiness. On your side, you'll have approx half of that, perhaps a bit more. Units starting adjacent to each other gets a +25% damage bonus. All in all, this what I would expect. And yes, it is very depressing for the allies because you feel you can't do nothing against them.
You can mitigate a bit the impact of Panzers against your troops, at least with the UK by bombarding them with planes. But you have to expect losing almost one unit per turn against them. In time, with additional tech and concentrating several units against them, you can wear them down. Each point they lose is a victory in itself, because after a few turns, when they are down to 5-6, the German player will have to make them rest 1-2 turns.
Readiness is just the most important stat. If you can launch a counter-attack that will remove 2-3 points from a panzer (weakening greatly 2 of your units that will get very high losses), then you are good, this will make the tank more humble in its attacks.
If you can't afford that, then you have to accept that tactically, where there are tanks, you are for a bad time. It means you must think strategically, and use the 'dilute Germany' strategy, i.e you want to force Germany to be too spread, so that his troop density is preventing major operations as much as possible. I had quite some success with that by multiplying smaller landings and harassment. This is also very important because Russia needs all your help (you have cranked the UK to USSR convoy percentage to 40% right?)
Not sure you'll see the light at the end of the tunnel though, my PBEM as allies are generally stopped by the Axis player when he starts stopping winning and I start to bite back (3 in a row). So in effect you are his punching ball, and then he quits. That must be why I have stopped PBEM'ing
AGEOD Team - Lead Developer
Makers of Empires, ACW2, EAW, WIA, WON