Probably worst thing I find from Sudden Strike, are those awfully hard missions after a few missions.
When you play for germans, and get your first Tiger I's, you'll be already facing IS-2's (uh.. year 42 meets year 44 generally)
Sometimes hard to organize units in an attack, since many units and there happens so much.
Probably most annoying thing that there is, which is actually is behind those awfully hard missions, is the artillery.
In attack to stalingrad mission, my units were quite a toast after the artillery when I tried first time

I smartened up and used motorcycle to clear up few howitzers for myself and dragged them to safety... 6 howitzer battery works well

(I leveled whole stalingrad house by house, there wasnt much to do after that... talks for the power of howitzers)
In one mission, where has to capture some top of the line tanks from germans as US, theres so much artillery that my units were big toast once again. (and no chance of completing the mission anymore, even with those "super" tanks I got, which didn't blow up on the way back home)
Simply said: Artillery caused it to be uninstalled in first place, after a few missions and many hours.