I can breath once more.

They aren't auto killed now.
It's just the roll of the dice. (I should correct my earlier post and mention that I didn't actually convert the Pylon origionally, Jervis did that.  I just left it that way because it was exactly the way the 40k was.)
If you are afraid of Pylons, then you have to do something shocking and change your tactics to to reduce their effectiveness or supress them long enough to create a drop window for your air force.
I've said it many, many, MANY times before, and hopefully one day people will get it.  You cannot fight the Necrons in the same old way.  You HAVE to adjust your strategy and tactics to fit your enemy.  If you aren't capable of doing that, why do you bother to play wargames?
People freak out about "popcorn" armies (despite the fact that they are fundamentally unsound and easy to defeat), and the boogeyman Pylon.
The Pylon's only real use in a fight it to give you what Greg Lane calls a "personal blast marker".  If you're scared of it, it's doing it's job.  It's only when you cease to fear the Pylon that it becomes essentially helpless.