One word, folks, can emulate this in D&D:
EPIC
Epic Level play in D&D can easily emulate Kratos. Kratos would be past 50th-level, most likely, with over 20 levels in Fighter, over 20 levels in Warblade, and he probably has levels in an epic prestige class like Dreadnought and something more unique. His abilities are obviously epic level items and/or artifacts and his feats are most likely a combination of standard, epic, and epic unique feats (being feats not yet created by WotC, that is).
If you want to run campaigns like God of War then you folks need to claw into WotC's back about more epic level content. It's minimal, moreso than psionics, and it's really sad considering I personally would love to run epic games like God of War.