Of late I've been trying to really learn my army (the necrons) and get better with them. I bought Fritz's pdf how to win with necrons and I'd have to say it helped me alot. I already knew alot of what was in the pdf but it helped to have it reinforced. For instance I know to keep my units together that way if one unit is wiped out a unit nearby will pick up the guys who died with we'll be back; but sometimes I end up spreading my units out too much. I think personally I've come a long way as a player but I still have alot to learn as do we all.
The One thing that I really need to work on is castling up, it's esential to the necron victory. I've tried to play as many of the Space marine players do esentially barring down on my opponent, it doesn't work for Necrons. The main thing is you need to have your oppenent come to you. Sometimes your oppent will not come to you and they will sit in their corner and drop templates and las shots into your army. In this case bring the heat, turbo boost that destroyer lord with scarab escort right where your enemy MUST deal with them and while your at it deepstrike your monolith in the middle of their ranks. Of course this all ends up being a judgment call. I'm certianly not going to deepstrike my monolith into assualt range of Moros's defilers or Brother C's venerable dreadnouight, Actually I might try it once just to see what happens maybe I'll get lucky.
I just learned recently that the C'tan ignore all saves which makes a huge difference in the way that I play them and I also learned how the monolith portal works. The Portal says it works like disembarking from a transport so the unit I teleport can't have moved and if I move the monolith I can't move the unit I teleport.
Lastly I haven't been able to truly appreciate how awesome some of the Necron fear tactics are. The nightmare shroud is EPIC in my last game I forced two marine squads to run off the board with it and another squad was running when the game ended. Normally I'll play either Moros, Brother C, or the Prophet all of whom run fearless heavy armies but against normal space marines and blood angels you can use all your fear evoking goodies.
Like I said at the begging of this post I've got a long way to go but I'm getting better and showing a lot of people in our local area that Necrons are still a viable army. All said Moros and I have discussed that Necrons are really easy to be ok with because they are forgiving with their high armour, toughness and the We'll be back rule. The problem is Necrons are difficult to master, as opposed to aggressive/ assualty armies, and I've seen the other players in my group quickly pass me in terms of skill with their armies and now I'm closing the gap on them. Eventually we all reach a plateau in terms of skill hopefully mine is a long way off.