I played Orks once and lost; although not miserably. This is similar to the list I used and probably still would be using if I'd not been advised on a new list ;)
I think I used:
2 x 10 Berzerkers with a rhino each.
Abaddon with 20 cultists
Terminators with various weapons
A Lord with AoBF
Give or take some stuff, possibly DV chosen.
Now, you would use similar maybe even without rhinos and advance everything forward on the board just trying to get into close combat. No tactics just plain daft head down and aim for combat!
Oh and my new lists works very nice so far. Played 2 won 2 :D