I'm currently struggling against Necrons in our local game with my chaos space marines. Some of this has been luck, but in other cases I'm being a little outclassed and I'm looking for help
My opponents tend to go for 1 big unit of Necron warriors (20ish) with a lord and res orb, 6 wraiths (which my 8 zercs with champ with powerfist and sorcerer could beat in 8 rounds of combat, ok he did make every armour save except 1....) doom arc 2 units of heavy destroyers and the like. the other opponent tends to go for scarabs, Annihilation Barges and the like with smaller units of necrons warriors. Both of course take immortals.
my own armour tends to have plague Marines in 6 man squads, 1 unit of zerks, a sorcerer with lash (though I'm going to change this to a D. Prince), some oblits, a vindicator and a Defiler.
big problems I have are in kill points, my army tends to have around 12 kills points total whereas my opponents have around 8. I suffer easy kill point losses due to Rhino's being popped and cannot make the points back. My current thoughts are that I need to assault them more. Cron's seem to be an attrition shooty army with limited (but good) assault capability versus meq armies.