Back in 2011, I remember a murderous and relentless Soviet AI pushing me constantly when I played Germany in the 1944 Gotterdammenrung scenario. It was almost impossible to survive, let alone win (beat the USSR) on very hard difficulty, and I LOVED IT.
But compare that AI with the garbage we have now. In my current '44 scenario, all the Soviets do is strategically redeploying their troops all over the place. I mean, seriously, it's ridiculous - half the Soviet divisions spend their time moving up and down the front, instead of attacking. If the Soviets DID attack and use their troops to full effect, they'd utterly roll over me. But, alas, it seems that the AI is unwilling to attack unless an attack starts at more than 50% progress, AND it has some fetish for constantly strat-redeploying divisions.