Does anyone else think necrons won't be a fun enemy to fight?

If we do get necrons in SM3, I have a feeling that they'll have most of the same issues as the Thousand Sons have in SM2. For one, they can teleport and also they can reanimate, similar to how sorcerers can revive rubrics. The only way I can see necrons working right is if they're built for endgame. They show up in the 2nd or 3rd act of the campaign while another horde faction takes the spotlight in act 1.