Audience-Alienating Premise: If you are a Warcraft fan, the sheer bias towards Warhammer will be far too much to stomach this fic. The author pretending that any Space marine would have a better grasp of realistic tactics than a warcraft army is a good indication. Hell, read the way some people talk about Warcraft on thus work's main page.
Squick: There are moments of this in some chapters. For example, Azechral uses the Blessings of Slaanesh to drive a paladin insane with lust, causing him to be lost in a sea of ecstasy that drives him to basically have sex with the mutated, inhuman, and mindless remains of his Mage girlfriend who has been mutated by the Powers of Tzeentch.