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Necrons have 24" guns, 36" max with destroyers. I'm assuming you were playing around 1000 points, and since he used a monolith, he probably didn't have much else.
You staying outside of his range but still being within killing range of your guns won you that one game.

I would watch out for any opponent with superior range or speed to your suits. Anyone with some mechanization will drive over to your suits and smoke them, then focus on taking apart your column. Hordes might as well ignore the few casualties your suits do at range and murder them if they come close to use flamers. And god help you if you face a real gunline.