I playtested Korsun and yes, the operational/tactical situations on both sides in the campaign is too tough for the AI to handle well. I wasn't on the playtest team for Rzhev, but am currently playing it as Soviets against the AI to see how it goes. I loaded up most of the options in favor or the axis (virtual supply trucks is a biggie since the supply sources are a LONG way from the front line and the alt artillery fire rule combined with counterbattery fire will cause massive casualties to the tightly packed Soviet formations and really make you think twice about using those 96-tube heavy mortar units.)
So far the game is very bloody but I am making steady progress and after 1 1/2 days have captured Osuga. South of Belyi I am also making good progress. My personal victory condition in this playing is to achieve Zhukov's goal by pocketing of the majority of the German forces
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I don't think I would attempt this campaign as Soviets pbem against a veteran German commander unless the options were loaded in my favor. The default rule settings mostly help the Soviets.
"Comrade" Jarrel
www.theblitz.org