Went to a GW to play a game of 40k, last time I brought only terminators and got pasted so I decided for a change of tactic and bring a gunline instead: tanks, devastators and a typhon (antitank now).
My opponent brought lots of infantry, a flyer a hover gun and an ark
I got first turn and opened up: the hover gun died
Then the flyer
Next turn the ark was killed despite its powerful shields
Then it was time for the infantry squads to die
Finally after killing most of the warriors and all the inmortals, the enemy conceded
Warhamer 40k is a game of lists nowadays, bring the more shooty and you win. Custodes are cool and all but it's a matter of who has the better guns.
Since the necrons had ultimate regeneration powers it was a matter of concentrating fire to wipe out units in one turn so they wouldn't recover wounds the next. Since I got plenty of firepower I began with the vehichles and then switched to the infantry. As in the previous edition necrons are diehards but don't kill much, they are better used as allies to grab objectives.
Also, pointless to take bolter squads when you can have lascannon ones.