#5 - Sept. 14, 2011, 6:43 p.m.
It has to do with how we designed our levels. Since the Barbarian literally leaves the ground, he is technically jumping over the bars/walls. The Demon Hunter always stays on the ground, so he will get blocked by stuff.
Also, the Barbarian is able to jump down off of some ledges to the floor below, depending on if he can land there. The Demon Hunter on the other hand cannot.
It's just a difference in how we designed their skills. Good question though!