We have a very long running campaign with a very high (16) Refresh with 2 WCVs. One went the "fighter" way, boosting Strength, Recovery and Speed. The other went the "Mind-Whammy"-way and that kind of fizzled out after a while. At first we added some extra steps for bonus damage on the Lust-Attack (basically going towards the Kiss of Death that the King of the WCVs has in the books, as her character is the WCV-Queen of Prussia), but you can never keep up with the bonus damage a wizard will dish out. And then there is always the question on which monsters the attack will work: Humans, sure. WCV - yes. BCV? No, yuck! Fey? Dunno, roll lore to declare.
The player then dropped her last points into a white panther shapeshift, because her WCV became a one-tick-pony. Either it can be mind-whammied, then she wins. Or not, then she's pretty helpless. As a shapeshifter she can fight a little better and has some more options.