Not a big Superman fan, but I loved STAS. The Superman/Darkseid storyline was great. When they first meet, Darkseid offers to make Superman is heir and when Superman refuses, Darkseid says, "If you won't be my knight, you will be my pawn."
And they pay that threat off when the show ended on such a dark note--setting up the Project Cadmus stoyline that played out through Justice League and season 1 of Justice League: Unlimited...
Probably some of the best writing in the DCAU.
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No man is free who is not master of himself.~Epictetus