Eh, it's just that double damage is always useful while the other stanzas are for specific situations.
Bleeding only works on full hits, and since it's gradual it's hard to see the effect if you're not looking at sysinfo. The extra damage is about comparable to increase damage, the real use of bleed is that it can be stacked with increase damage.
Ignore armor is only going to be usefull against mobs with armor against piercing, which is only about 40% of the mobs. You'll be thankful for it if you run into such a mob though.
Accurate attack has been explained already.
Bleeding only works on full hits, and since it's gradual it's hard to see the effect if you're not looking at sysinfo. The extra damage is about comparable to increase damage, the real use of bleed is that it can be stacked with increase damage.
Ignore armor is only going to be usefull against mobs with armor against piercing, which is only about 40% of the mobs. You'll be thankful for it if you run into such a mob though.
Accurate attack has been explained already.