Missiles still go through armor *checks*
Missiles still require to wound on a 2+ *checks*
missiles launchers still awesome *checks*
*has no fear, MLs still pure win*
Anyways yeah it does seem pretty underrated, and nasty at that. Most armies that see that comin' towards them are about to have problems and know it. Just keep in mind that the same things that'll take down a carnifex, will take down a spyder. It's, on a base level, a group of 3 carnifexes stomping towards you.
Except now they're made of metal...
And create scarab bases...
... And float...
But anyways yeah, missile launchers, poisoned weapons, some well-placed/allocated-to-survive fists/klaws and other monstrous creatures *cough* WRAITHLORD *cough*. Hammernators will still cause them serious problems, still wounding on 2s, ignoring the armor save, and their own 3++ keeping them pretty well alive. Lastly some anti-tank fire can still cause them problems too, taking hits from lascannons and such still hurts just as much as ever.
Most of this is probably obvious, but I thought I'd throw it out there anyways. More than things can kill it, thing's can't kill it. And when they get into a combat with something, whelp, prepare to be removed from the table. Definitely something to look into.
And with the new Triach Stalker, Doomscythe, Wraith and Spyder models all rumored to come out this month or the next, the Necrons will have all the cheese they can handle!