Jedi feel like they have the option of "Standard Jedi" and "Jedi who missed his coffee this morning". Most of the other classes I've played feel the same way. I think it's because most are based on thoroughly established archetypes in Star Wars, where the agent is more of a clean slate.
Ha ha ha, that is perfectly said. I recall I was going to make my first Consular a Vrook Lamar sort (light side, but a jerk about it). The sort that expects everyone to live up to his impossibly high moral standards. Instead he ended up looking like he was bipolar. Super kind one second, super ticked off the next.
With the agent, you're treading carefully through tough political waters where everyone you meet has their own motives.