Its difficult to say what is my "least favorite class", because it isn't black and white. Every class will differ to the person who possesses it, so its impossible to completely predict what a class will turn out like. But, in my opinion, I think I wouldn't prefer any of the knowing/understanding classes (seer/mage). I just don't know what I would do with that information. I prefer attacking classes rather than support classes, but then again, a seer could also be a great fighter.