Glancing Blows, +Weapons, and Bosses

[MongoJerry]

Special attacks never "glance," so this only affects auto attacks.  Even so, normal attacks are ~50% of my damage.  A 13% increase on 50% of your damage is nothing to laugh at.

Absolutely, it would, but it matters when you're deciding between items -- like, say, weapon you're going to use, which could also make a dramatic difference in your damage output. So basically, a +10 weapon skill would add 6.5%ish damage, which is still quite a lot, but then one must then explore what items you would have to get and give up to get that +10 weapon skill.