I began the review that I wrote for Pagan Publishing's "The Unspeakable Oath" CoC magazine with "Kult is an evil game. You'll like it." I was so tickled when that began to appear in product ads
WoD-wise, I prefer to mix Kult with Mage (and to a lesser extent, Werewolf)---twisting the spiritual axes of the WoD universe into the Kult continuum is great. Kult's also wonderful when mixed into the background of a Delta Green CoC campaign.
I haven't actually played a straight-up Kult campaign before, alas. But there's always hope!