I gotta admit, guys, I play DoW, and I hate the Pike rules as they're written there. In short, they're too complicated.
Four ranks, counts as a Defended Obstacle, both rules (obviously) only to the front.
Cavalry lose their lances and (if other humans) are now matched for initiative. Brets lose the whole lance formation. Pikes win not by killing enemy horsemen, but by denying kills to them (since they'll score just over half as many kills at S3 instead of S5). Light cavalry WILL be slaughtered, period, even if they get to do a little damage first.
In addition, the Pikes remain a considerable threat to enemy infantry. Four ranks and no charging bonus for the enemy is nothing to laugh at. Dwarves, Ogres, and Undead will strike second. Humans are matched. True, some foes will still go first, but against four ranks of S3 attacks - and more of them, since pikes can cost less.
Truly heavily armoured and armed foes - Dwarf Ironbreakers, Chaos Knights, etc. - will still mow through pikemen, and they should. These awesomely armoured fantasy soldiers have little to fear from pointy sticks. But if the pikemen are State Troops, then slaughtering pikemen may still see defeat thanks to free companies on the flanks or a timely volley of handgun bullets.
I advocate these rules for three reasons:
a) Cost. Simple rules, no major benefits = lower cost pikemen = more pikemen. Always a beautiful sight, and nobody wants to spend 330 pts on a single block of humans, no matter what weapon they're carrying.
b) Precedent. Fights in Four Ranks is just an extension of the Fights in Ranks rule. And Bretonnian archers already have the Defended Obstacle against Foes to the Front rule. We're not making anything new.
c) Simplicity. The rules are straightforward and apply equally to all foes. No "our ASF is secondary to your ASF" things. Just move to Initiative and resolve the combat by the book.
Just my 2 cents.