I don't know, witch seems pretty much a gimped wiz/sorcerer, maybe it is bettere in the pnp.
The hex and unique abilities after the start of the game are not that useful (exept the bite attack).
Well, Sleep hex is solid and Owlcat buffed it greatly by removing Witch's lvl as HD restriction. No wonders here, it would be useless here in PnP version.
Protective luck is wonderful and does wonders to save high AC tanks from being critted on Unfair. No 24h cooldown like a normal luck so it could be spammed in each combat and extended with Cackle.
Evil Eye and Misfortune are cool if you can land some save or suck spell from another spellcaster and useful in general.
From the Major Hexes, Beast's Gift is good as I've mentioned - a free attacks for everyone.
Agony - close to Sleep but targets Fort.
And Grand Hexes are meh at the level where you'd get them.
As a package deal, I would rate them higher then Sneak Attacking cantrips from AT (as the main filler non-spellcasting action).
And Witch's spellbook is filled with some cool flavorful spells in PnP that will never translate properly into CRPG. And was truncated to the bare minimum in the Wrath(
And I am still conflicted over spontaneous vs prepared Witch. Spontaneous Witch-blaster can at least extend her repertoire with special Fire/Lightning themed items but pays for this with full-round casts for all Metamagic feats and this hurts.