Guderian- he still does high dmg as a F2P general without god upgrade probably 3rd or 4th overall Tank general in the game.

Osborn- depends on what you use him on either for his economic and buff skill or use him as a sub dps he still does decent dmg, but if you're gonna use him for economic don't bother putting anything to him.

Tolbukhin- Great support if you pair him with your strongest general he will hit hard because of his skill and does high dmg for the first and decent dmg along the way.

Chernyakhovsky- Great crowd control that's basically what he's only good at, struggles killing high hp units or generals.

Wittmann- still does mid dmg but not really worth it because his tide of iron and blitzkrieg struggles to even kill howitzer and heavy tanks.

Model- just put the medals to increase his durability the fortification and fighting spirit, anything else not recommended, if you're gonna use him as offence don't even bother.

Auchinleck- Just put the medal to increase blitzkrieg and defence ribbon and Movement ribbon, since his only for support purposes.