In terms of the actual personalities themselves, I think they're deeply flawed, because they don't match many of the patterns people would use to min/max traits. For example, if you're making a backstabber who doesn't use the Man-At-Arms skills at all (and thus no attacks of opportunity), the combination of Heartless and Vindictive is worthless.
I'd say that if your intention is min-maxing you should do it yourself. Can't blame the devs for that. Switch off the AI personalities and optimize your choices to the chars you build.
There should be a minimum of action required for min-maxing after all...
Personally, unless I really absolutely want a specific outcome, I just go with the results - it's actually more fun to play that way for me.
A lot of design has been put in those dialogs and traits so it's rude to say this, but for me those dialogs little challenges burden a lot my play and I don't mean only the rock/paper/scissor mini game I just hate for single player.
You can turn them off entirely in the menu, can't you?
At least there's an option somewhere, but not exactly sure what is turned off there.
