I hate having to admit this but there is really only one way to run Orks and give other armies a run for there money. That is to run zagsnark bikers, a group of 6 with him another warboss with claw and lucky stick, and a painboy. (Nob with pk if you have points). Then 4 to 5 groups of 3 bikes. Then run the cheap big Mek stompa put some grots in it to give it obsec. Then march up the board and hope they aren't running 3 wraith knights.