The thing with weapon skills, btw, is that 10% is more than 10%.
That sounds silly, but let me explain:
If you do basic attacks of exactly 100 damage, and your enemy absorbs 50 due to armor, having 1 point in the weapon skill increases your damage to 110 total, but it shouldn't change the absorb. So that 10% just upped the final damage from 50 to 60, which is a fair bit more than 10%.
Basically, weapon skill is more powerful against enemies with high armor, but less impactful against lower armor. However, for a 2H warrior (for example) there aren't that many skills you really want to sink your points in, so putting a few into 2H is a good idea. (plus, with gear bonuses you can get up to +7 or +8 if you're lucky, which is a good chunk of damage)