Are you referring to how the witch doctor looks (physical appearance + armor options) or how the hero interacts with other characters in the game and progresses with the story arc? Or is it all about gameplay, and what spells the witch doctor has in its arsenal?
This is just anecdotal, but I've experimented with all five classes on various genders, too, and the witch doctor (female) is my absolute favorite in terms of how she engages with the main the characters and responds to conflict, so I'm curious about what just doesn't "click" for you.
/eagerly waiting your response
most spells don't feel very useful and those that do feel useful have very long cool downs so the spell because less useful.
example: grasp of the dead - basically a snare... but it has a longish cool down (the duration of the snare) when demon hunters can throw 3-4 caltrops (also a snare) with no cool down though discipline regenerates more slowly.
conclusion: Caltrops feels useful, grasp of the dead feels nearly useless
I find some of the best spells either shave a long casting time, a long cool down, or just such a short range that you need to get close to hit anything.
-they die too quickly
-cool downs are too long (cool downs here actually don't make too much sense conceptually)
-nearly useless, and not worth the slot on the hot bar
-makes the witch doctor look out of place even more so then the skills do.
-caster class with a melee class specific weapon. you run out of mana and you will find your self running into melee range unless you hold shift down.
class specific weapons:
Demon hunters get bows and crossbows - this keeps them out of melee range
wizards get wands - run out of arcane power and they stay out of melee range
witch doctors get daggers - run out of mana you run into melee range.
--> witch doctors class specific weapon isn't ranged but they play like a ranged class <--
Overall for a class that was meant to replace the necromancer from Diablo II (which was my favourite class there) It plays nothing like it and I do not like the feel or aesthetics of the witch doctor and do not feel it is a good replacement for the necromancer. I would have rather seen the necromancer come back really.
Oh and while I'm talking about aesthetics, please please please take the heels off the female demon hunters boots!!!