I would just like to say that I enjoy (as Germany) this mod far, far more than vanilla or C.O.R.E. I think it's because of how much harder... not, not harder, more challenging, it is.
Let me give an example. Ok, I'm Germany. Poland falls (in my second game, I think), in 3-5 weeks. Airpower and tanks broke them, everything was fine.
So, this was my second game, after the latest mini-patch. I learned from the first that the western front can really, really bog down if you don't do it right. So I come up with this brilliant plan. Since getting stuck somewhere can make this WW1, I decide to run trough the Ardennes. I mean, it's just the shortest way over the big rivers, and should be undefended if I can break the Belgian troops in the south fast enough. For the rest of the line I mostly concentrate on keeping the enemy in check.
It works. The French are busy trying to attack east from the Magnitot-Line, and I reach Paris (after a month of fighting), and I get Vichy. Then I got a crash... I think it was the fault of HoI, not TRP. Happens in vanilla often too.
The second time the French are busy trying to break trough eastwards, they get their defenses ready in time, and the whole thing falls into a ten-month slugfest (which I eventually win).
I could talk about the eastern front, and the North-Africa front (I suppose some 3-5 million casualties on both sides there in total. Pushing the British out of Persia and India was a bitch. It was fabulous.
In any case, remember that long, hard battles work both ways. You need to keep the enemy from moving in a couple more divisions to the defence, and make the right strategic choices. If I hadn't allied Persia and then spent 1,5 years pushing the brits far enough away, I could never have defeated Russia in a mere two years.