It's funnyif you deep strike a full 20 ork mob of either skarboyz or flash gitz into a enemy emplacement.
The skarboyz start a huge assault rumble. And flash gitz, upgraded to more dakka, will rip through any force because of the sheer volume of fire. Who cares about accuracy, just as long as you can fire a whole lot!
Goffs can be good but they can't get normally good ork things, such as the war trukks (which can bring your boyz to the enemy so much faster, extremely useful for a Goff army). tHe Goffs can get much for shooting units, so they can lack as tank hunters. But you can say the same to Bad Moons about assault units.