Well, yeah, that's supposed to be the point of the whole army: tough.
they get the board control and I can't fight back and they take me out piece meal.
Here's where things might be going wrong.
Are you spreading your forces out to try to engage him everywhere at once? Because the best way to kill Necrons is to focus them down one unit at a time.
...
However, if your goal is to KILL Necrons, you're probably not going to have a good time.
You're better off trying to out play them.
If your opponent is taking a Decurion he will completely lack ObSec. Being the case, if you go anywhere near an objective with YOUR ObSec units, he won't be able to do anything about it apart from try to kill you off of it.
But here's the thing: Necrons are not that killy. As I said above, the main strength of the army is its hard to kill-ness. Their killy-ness is only moderate.
SW definitely top them in murder ability.
AND, another tactic I don't see people employ enough is trying to engage their shooters immediately. "Oh, I won't be able to wipe out that unit of Warriors so I'm not even going to bother."
WTF are you doing?! Warriors are garbage at combat but decent at shooting. By leaving them unengaged you're letting your opponent use them exactly how they want! You want to tie them so they're not shooting. This goes for all their shooty guys (except Praetorians. Don't rush into combat with them. They're blenders).
My opponent usually brings something like a chaiot, a handful of warriors, a ghost ark, night scythe, lychguard and the canopteck (however you spell it) harvest.
Luckily, apart from the Canoptek Harvest, those are all meh choices. Not utter garbage, but definitely not best stuff in the codex.
My recommendation would be to:
- engage the Warriors ASAP (goal is not necessarily to kill, just tie up so they can't shoot).
- rush something fast and disposable up to catch the Wraiths before they can catch your
TWC and tarpit them.
- avoid the Lychguard (they're slow and can't shoot, not really worth worrying about).
- always shoot at the vehicles. New
FAQ significantly reduced their effectiveness when jinking, so try to get them to jink as much as possible.
- Chariot is a distraction. Do not shoot at it, that would be a waste. If anything has a powerfist or melta bomb or something, try to catch it in
CC so you can explode it.