Talk:Warwick/@comment-17738098-20140519162055/@comment-4022742-20140520055023

Even when you don't really build any heavy AD the armor penetration helps out a lot. Your early game clear will increase significantly when compared to full Mpen runes, seeing as neutral monsters don't have any magic resist, but they do sport some hefty armor.

With hybrid marks you trade in 2.25 Mpen for 8.1 Apen. That 8 Apen is definately noticeable during early farming, and even late where you have 120 AD with feral (even more with BotRK) against champions. You could run percentage calculations, but I can guesstimate that it'll be well worth going for hybrids.