Bah, you probably would have got a minor win. It is a tournament DE list and you played well. I made a couple important mistakes (DSing that squad into oblivion and diverting the Wraiths Squad III to help a scythe overlord kill an AV11 vehicle). And, my list is still rather wonky (ABs in an Imotekh list??).
Regarding wraiths, if you think that is the extent of the necron horror, wait to see my improved list. I call it THE REAPERS.
We Necrons pride ourselves on our equal-opportunity harvesting policy.