@Velium: At least one of the players does run halberd spam, I haven't seen the other guys list yet. Is it worth the mandrakes giving up infiltrate/outflank? Are you suggesting to run them on foot in my deployment zone? I also fight Eldar and 'nids, so while the Crucible is unpredictable, it seems too much fun to pass up.
@Cheese: Warwalkers outflanked me, blasted my venom out of the sky, and then caught up with my trueborn as they were making a retreat from the wreckage. The Ork player runs a lot of killa kans and dreads, so it's useful for tank killing if I get desperate, though as you say, I will probably already be losing.