Just got thoroughly caned by the Necrons and have to get sympathy and advice from my tau brothers. I made a few mistakes which I'll outline before I moan about the necrons and their abilities.
My first mistake was to use the same army I just used to whoop some imperial guard forces earlier in the day, I'd wager that fighting necrons and IG is quite different.
My second mistake was deep striking my stealth team (all 195 points) so that they scattered right off the table edge (11" scatter) ... ouch!
Finally I used a unit of kroot with hounds which was pure folly. Even though they managed to rush into hth and kill a tomb spider (amazing) I will never again deploy kroot versus the necrons since they are just too puny and those 3+ armour saves mean the necrons won't die.
The good things I did were several, I used mobile tactics with a stationary hinge. The flanks were hit with a hammerhead/devilfish w fire warriors (right side) and Drone sqn/2 crisis suits (left side) the problem was that the left flank was rolled up by 3 wraiths that took about 30 direct wounds throughout the game but either made their 3+invulnerable savers, or their We'll Be Back rolls.... I really hate wraiths since they are sooooo fast and have two invulnerable saves (counting the WBB)
Otherwise the necron lord veil of darknessed his units round like mad and hit me from all over... the wraiths were the winners in the end however and I managed to kill very little throughout the game as he chewed me up.
ideas on force structures v necrons would be appreciated, and what do you think about wraiths and THOSE SAVES
take care, I'll try to avenge my defeat soon..