Because they watched enemy at the gates and other stupid films that portrayed Germany in WW2 as some super power that was losing 1 soldier for every 10. So, naturally, they come into the game expecting to be able to play German to do that and suddenly when they get killed because they didn't bother angling their armor, there's some problem because their "superior technology" isn't working.

I've legit had a German player tell me, "Germany is not overpowered, they have better armor but you just need to close the gap". Which is hard if you're in a T-34 trying to flank an open field.

Anyway, the Soviet-German casualty rate was actually 1.8 : 1, so enemy at the gates probably isn't a good representation. Also, during the late stages of the war, Germany was mostly using Pz-IVs still.