@Pollob bhai - Another Review.
It is the most amazing thing of the game for me.
The attribute that suffers most from under-utilization is Voodoo, which has a ton of interesting uses that are consistently underutilized. Voodoo mind control in particular is a lot of fun to use, but you can only use it as determined by the developers, as only when they offer you the option to get a lock of hair or something similar from the character can you finish a voodoo doll. This is completely understandable, as for every voodoo-controlled character they have to write and voice unique dialog not just for the character, but for the people you talk to while controlling him, as you can run around pretty freely (albeit within a limited part of the map) as the mind-controlled character. But understandable though it may be, it feels pretty underwhelming for a player.
As a combat option, I never saw much use in Voodoo. You gain the ability to create scepters with different effects, such as inducing fear or aggression, but I found the mechanic of using it and then switching back to my sword so awkward that I ended up just using my sword for my entire voodoo run. You can use the scepter as a close combat weapon, but their stats are terrible and even an inexpert swordfighter is much better off with a blade. Scepters are useful to stun enemies or turn them against one another, it's just not particularly fun or engaging an option.
The ghost summoning skill is much more useful for combat, as it basically gives you an extra companion, and one that is actually available when the others are not. The ghost will fight alongside you as companions do, and can be re-summoned if he's "killed". But once again, there is an amount of under-utilization here, as I only found one ghost I could summon, where you would think this spell could also be of use in solving certain quests, or even opening new ones where you dig up a dead man's treasure, or offering extra ghost companion options. In general, while I did not get to finish the game using voodoo, the impact of voodoo felt a little underwhelming.