last weekend i saw orks used in two very different but effective ways. the first was by Benton English out of st.roberts; he was rolling the nob bike deathstar, these guys have some new life in 6th ed. packed in with a green tide and tau allies, he won the main event.
the second was just what you are doing here. burnas in battle wagons. Joey Addison pulled this in the team games and took first. you cant assault the battle wagon, or at least not unless you want to take 15D3 hits. then the mass death from the def rolla and the stack of templets takes care of the rest. this was nasty.
i like the mega nobs, they were always great just slow. now there just great, but you may have a problem delivering them. i would agree on dropping the dread as well; he doesn't fit the list very well. also, i dont know what i think about trucks anymore, but i havent seen them in action to really give any critical advice on them.