Story mode isnt very good. Not just Human, altough i find it quite bleghworthy (its a word) how you are both naive and a saint. It makes the character quite one-dimensional.
The choices are a laugh, and the only one that has any real impact is which faction you join.
Sadly, Story is not as "optional" as people claim. Sure you can play most of the game fine without doing any story at all. But so far the only way to get a good back-slot equip is either a hefty sum of gold if the guild has a certain unlock or high-level story quest.
And if you want World Completion, there is one poi in Straits of Devestation that seems only accesible if you do the story mode upto pretty high levels (70+)
So other aspects of the game are impacted or impeded if you do not do the story quests at all. And it gets a little better later on, but not by much. Trahearne (or whateverhisfaceisspelled) is also a very one-dimensional and uninteresting character.