Ignoring ALE, and assuming current MM. Full force Darkseid operating from his higher dimension to MM operating from a lower dimension is the only way this would be a "good" fight. Though MM should logically be able to sidestep that restriction. Or something. Weird how that works.
Owen slays Darkseid on equal footing. Darkseid beats any MM outside current from his own dimension. Darkseid with Soulfire beats any MM outside current on equal footing. Darkseid with ALE should be able to easily beat any MM.
Dark Avengers Molecule Man beats current Molecule Man and Darkseid with full ALE and Soulfire together though.