Masquerain, mainly if I want to run Bug/Flying/Ground coverage and not run Hydro Pump if I dont want to.What exactly is the Pokemon you are looking to breed though? I basically took a look at a list of Pokemon that gets Mud Shot as Egg Moves, and neither of them actually need the Ground coverage, either that or they get better Ground moves. But anyways Mud Shot is still a decent choice if you don't mind the drop in accuracy, considering then you can get HP Fire or something for coverage too.
though I'd thought I'd ask this question in case I come accross other Pokes with Mud Shot but no access to better Ground Moves other than HP Ground.
Not exactly OU material so dont know if its worth asking here but meh.