From my direct experience Ork heavy attacks have a competitive momentum, but our light attacks are a joke. Ork heavy attacks still have less momentum than the heavy attacks of other factions but the raw difference in applied capability is smaller. Ork heavy attacks can actually catch people backpedaling, but they can't catch sprinters like the heavy attacks of other factions. Ork light attacks can be avoided by walking backwards..... Personally I like Ork heavy attacks and think they are in a balanced place, because though they have a smaller effective range most Ork melee weapons will apply a stun with a heavy attack, so its a bit of a trade off. You could leave Ork light attacks as they are from a momentum POV if they applied a small stun with choppas/axes/clubs as well
