Unless you automatically decide to take an AoO or engage him in melee even without an AoO.
You wont take AoO when creature is using special abilities like gaze is, the only time AoO could happen is if the creature would used ranged weapon/cast a normal spell (without ICC) on you and that will still not happen everytime but only from a short range, since spellcasting is once per 6seconds, sometimes 3seconds its not happening so often, if the creature would firing from range weapon than yes but this should not happen, first its bad design, second why would you want to do this against ranged weapon firing monster?
Anyway, point is that you can turn around very easily and very fast via mouse movement almost anytime when neccessary. Okay I was wrong about spellcasting, there is really a channel but still that does not prevent to abuse the positioning to your advantage. I assure you that with a feature like this on gaze effects, a smart and experienced player would be able to dodge it every single time. Just as they are able to dodge pulse abilities simply by running away (with haste) in exact moment and then return back. Its a same mechanic and you can try it yourself.
1) make a creature that will have 10 pulse abilities, fire, cold whatever.
2) temporarily (since you dislike it) install my patch v 1.71
3) take a character with haste and go there and dodge the pulse abilities.
(again reminder why this is not possible in vanilla - in vanilla pulse abilities are casted on target and will be centered on target, even if that target runs away - the pulse ability in queve will be cast and appear centered on the target and damage him wherever he is - in my patch pulse abilities are self-casted centered on ability owner and hits only those who are in short radius)
You will find out its very easy actually and same method could be used vs gaze abilities monsters but even without haste (its possible to dodge pulse abilities even without haste, but much more difficult and require move in move back method or harming the monster after she cast a pulse ability so AI runs and give command to use new pulse which gets into queve as she cant do any actions till new round). With melee/ranged weapon its extremely easy, with spellcasting a bit difficult and only possible if you are hasted and creature is not hasted, but possible.
Are you suggesting that if you walk up to me from behind and I take an AoO on you that the game considers me facing away from you?
Im not sure if I understand. But it happens on your commands. Yes if you try to move away from a target with a single mouse click and then you get AoO, your character will cancel that command, turn around and attack target. However, if you spam the mouse clicks to get away, the AoO will be executed but your character wont turn back, he wont even play attack animation. Same situation happens when you first use mouse click to cancel your current action like attack and turn around from your target and then you use W key to move forward.