baring in mind that i haven't actually read hagel and only some marx, so i possibly have no idea what i'm talking about, i think in a basic sense the dialectic is a great tool for studying things. i think marx showed us how to aply it effectively. but maybe the failing of any overly strict form of marxism is that it doesn't account for the uncountably infinite ways dialectics can be applied and how politics is more about philosophy than religion.